List of Strigiformes by population

This list of owls is not comprehensive, as not all Strigiformes have had their numbers quantified. For a simple list of all owl species, see the article "List of owl species".

Extinct species:

• Bermuda saw-whet owl, described from fossil records and explorer accounts of the bird in the 17th century.^[1]
• Laughing owl, last seen in 1914.^[2]
• Mauritius scops owl, last seen 1837 and certainly extinct by 1859.^[3]
• Réunion scops owl, went extinct in the 17th century after the colonization of the island of Réunion.^[4]
• Rodrigues scops owl, last recorded in 1726.^[5]

Species by global population

Common name	Binomial name	Population	Status	Trend	Notes	Image
Abyssinian owl	Asio abyssinicus	?[6]	LC[6]	[6]
African barred owlet	Glaucidium capense	?[7]	LC[7]	[7]
African grass-owl	Tyto capensis	?[8]	LC[8]	[8]
African scops owl	Otus senegalensis	?[9]	LC[9]	[9]
African wood owl	Strix woodfordii	?[10]	LC[10]	[10]
Akun eagle-owl	Ketupa leucosticta	?[11]	LC[11]	[11]
Albertine owlet	Glaucidium albertinum	2,500-9,999[12]	NT[12]	[12]
Alor bookbook	Ninox plesseni	?[13]	LC[13]	[13]
Amazonian Pygmy-owl	Glaucidium hardyi	?[14]	LC[14]	[14]
Andaman boobook	Ninox affinis	2,500-9,999[15]	LC[15]	[15]
Andaman scops owl	Otus balli	?[16]	LC[16]	[16]
Andean pygmy owl	Glaucidium jardinii	?[17]	LC[17]	[17]
Anjouan scops owl	Otus capnodes	2,300-3,600[18]	EN[18]	[18]
Annobon scops owl	Otus feae	50-249[19]	CR[19]	[19]
Arabian eagle-owl	Bubo milesi	4,000-9,999[20]	LC[20]	[20]
Arabian scops owl	Otus pamelae	60,000[21]	LC[21]	[21]
Ashy-faced owl	Tyto glaucops	?[22]	LC[22]	[22]
Asian barred owlet	Glaucidium cucoloides	?[23]	LC[23]	[23]
Austral pygmy owl	Glaucidium nana	?[24]	LC[24]	[24]
Australian boobook	Ninox boobook	?[25]	LC[25]	[25]
Australian masked owl	Tyto novaehollandiae	?[26]	LC[26]	[26]
Baja pygmy owl	Glaucidium hoskinsii	?[27]	LC[27]	[27]
Balsas screech owl	Megascops seductus	20,000 – 49,999[28]	LC[28]	[28]
Band-bellied owl	Pulsatrix melanota	?[29]	LC[29]	[29]
Banggai scops owl	Otus mendeni	10,000-40,000[30]	NT[30]	[30]
Bare-legged owl	Margarobyas lawrencii	?[31]	LC[31]	[31]
Bare-shanked screech owl	Megascops clarkii	20,000-49,999[32]	LC[32]	[32]
Barking owl	Ninox connivens	?[33]	LC[33]	[33]
Barn owl	Tyto alba	4,000,000-9,999,999[34]	LC[34]	[34]	Includes all subspecies
Barred eagle-owl	Bubo sumatranus	?[35]	NT[35]	[35]
Barred owl	Strix varia	?[36]	LC[36]	[36]
Bearded screech owl	Megascops barbarus	20,000 – 49,999[37]	LC[37]	[37]
Biak scops owl	Otus beccarii	15,000-45,000[38]	NT[38]	[38]
Black-and-white owl	Strix nigrolineata	?[39]	LC[39]	[39]
Black-banded owl	Ciccaba huhula	?[40]	LC[40]	[40]
Black-capped screech owl	Megascops atricapilla	?[41]	LC[41]	[41]
Blakiston's fish owl	Ketupa blakistoni	1,000-2,499[42]	EN[42]	[42]	This subspecies is included under Bubo blakistoni.[42]
Boreal owl	Aegolius funereus	730,000-1,810,000[43]	LC[43]	[43]
Brown boobook	Ninox scutulata	?[44]	LC[44]	[44]
Brown fish owl	Ketupa zeylonensis	?[45]	LC[45]	[45]
Brown wood owl	Strix leptogrammica	?[46]	LC[46]	[46]
Buff-fronted owl	Aegolius harrisii	?[47]	LC[47]	[47]
Buffy fish owl	Ketupa ketupu	?[48]	LC[48]	[48]
Burrowing owl	Athene cunicularia	?[49]	LC[49]	[49]
Buru boobook	Ninox hantu	?[50]	LC[50]	[50]
Camiguin boobook	Ninox leventisi	250-1,400[51]	VU[51]	[51]
Cape eagle-owl	Bubo capensis	?[52]	LC[52]	[52]
Cebu boobook	Ninox rumseyi	250-999[53]	VU[53]	[53]
Central American pygmy owl	Glaucidium griseiceps	?[54]	LC[54]	[54]
Chaco owl	Strix chacoensis	?[55]	NT[55]	[55]
Chestnut-backed owlet	Glaucidium castanonotum	10,000-19,999[56]	NT[56]	[56]
Chocolate boobook	Ninox randi	?[57]	NT[57]	[57]
Christmas boobook	Ninox natalis	1000[58]	VU[58]	[58]
Cinnabar boobook	Ninox ios	?[59]	LC[59]	[59]
Cinnamon screech owl	Megascops petersoni	?[60]	LC[60]	[60]
Cloud-forest pygmy owl	Glaucidium nubicola	1,500-7,000[61]	VU[61]	[61]
Cloud-forest screech owl	Megascops marshalli	?[62]	NT[62]	[62]
Colima pygmy owl	Glaucidium palmarum	20,000 – 49,999[63]	LC[63]	[63]
Collared owlet	Glaucidium brodiei	10,000,000+[64]	LC[64]	[64]
Collared scops owl	Otus lettia	?[65]	LC[65]	[65]
Colombian screech owl	Megascops colombianus	6,700[66]	NT[66]	[66]
Congo bay owl	Phodilus prigoginei	2,500-9,999[67]	EN[67]	[67]
Costa Rican pygmy owl	Glaucidium costaricanum	?[68]	LC[68]	[68]
Crested owl	Lophostrix cristata	?[69]	LC[69]	[69]
Cuban pygmy owl	Glaudicium siju	?[70]	LC[70]	[70]
Cyprus scops owl	Otus cyprius	10,000-24,000[71]	LC[71]	[71]
Desert owl	Strix hadorami	?[72]	LC[72]	[72]
Dusky eagle-owl	Bubo coromandus	?[73]	LC[73]	[73]
East Brazilian pygmy owl	Glaucidium minutissimum	?[74]	LC[74]	[74]
Eastern screech owl	Megascops asio	560,000[75]	LC[75]	[75]
Elf owl	Micrathene whitneyi	72,000[76]	LC[76]	[76]
Enggano scops owl	Otus enganensis	2,500-9,999[77]	LC[77]	[77]
Eurasian eagle-owl	Bubo bubo	100,000-499,999[78]	LC[78]	[78]
Eurasian pygmy owl	Glaucidium passerinum	500,000-1,199,999[79]	LC[79]	[79]
Eurasian scops owl	Otus scops	790,000-1,350,000[80]	LC[80]	[80]
Everett's scops owl	Otus everetti	?[81]	LC[81]	[81]
Fearful owl	Nesasio solomonensis	2,500-9,999[82]	NT[82]	[82]
Ferruginous pygmy owl	Glaucidium brasilianum	20,000,000[83]	LC[83]	[83]
Flammulated owl	Psiloscops flammeolus	?[84]	LC[84]	[84]
Flores scops owl	Otus alfredi	250-2,499[85]	EN[85]	[85]
Forest owlet	Heteroglaux blewitti	250-999[86]	EN[86]	[86]
Fraser's eagle-owl	Bubo poensis	?[87]	LC[87]	[87]
Fulvous owl	Strix fulvescens	?[88]	LC[88]	[88]
Giant scops owl	Otus gurneyi	2,500-9,999[89]	VU[89]	[89]
Golden masked owl	Tyto aurantia	2,500-9,999[90]	VU[90]	[90]
Great grey owl	Strix nebulosa	50,000-99,999[91]	LC[91]	[91]
Great horned owl	Bubo virginianus	?[92]	LC[92]	[92]
Greater sooty owl	Tyto tenebricosa	?[93]	LC[93]	[93]
Greyish eagle-owl	Bubo cinerascens	?[94]	LC[94]	[94]
Guatemalan pygmy owl	Glaucidium cobanense	?[95]	LC[95]	[95]
Halmahera boobook	Ninox hypogramma	?[96]	LC[96]	[96]
Himalayan owl	Strix nivicolum	?[97]	LC[97]	[97]
Hume's boobook	Ninox obscura	?[98]	LC[98]	[98]
Indian eagle-owl	Bubo bengalensis	?[99]	LC[99]	[99]
Indian scops-owl	Otus bakkamoena	?[100]	LC[100]	[100]
Itombwe owl	Phodilus prigoginei	2,500-9,999[101]	EN[101]	[101]
Jamaican owl	Pseudoscops grammicus	?[102]	LC[102]	[102]
Japanese scops owl	Otus semitorques	?[103]	LC[103]	[103]
Javan owlet	Glacidium castanopterum	?[104]	LC[104]	[104]
Javan scops owl	Otus angelinae	1,500-7,000[105]	VU[105]	[105]
Jungle owlet	Glaucidium radiatum	?[106]	LC[106]	[106]
Karthala scops owl	Otus pauliani	2,300[107]	EN[107]	[107]
Koepcke's screech owl	Megascops koepckeae	?[108]	LC[108]	[108]
Least boobook	Ninox sumbaensis	10,000-19,999[109]	EN[109]	[109]
Lesser horned owl	Bubo magellanicus	?[110]	LC[110]	[110]
Lesser sooty owl	Tyto multipunctata	4,000[111]	LC[111]	[111]	Estimated to be around 2,000 breeding pairs[112]
Little owl	Athene noctua	5,000,000-9,999,999[113]	LC[113]	[113]
Long-eared owl	Asio otus	2,200,000-3,700,000[114]	LC[114]	[114]
Long-tufted screech owl	Megascops sanctaecatarinae	?[115]	LC[115]	[115]
Long-whiskered owlet	Xenoglaux loweryi	250-999[116]	VU[116]	[116]
Luzon boobook	Ninox philippensis	?[117]	LC[117]	[117]
Luzon scops owl	Otus longicornis	?[118]	NT[118]	[118]
Madagascar owl	Asio madagascariensis	?[119]	LC[119]	[119]
Makira Boobook	Ninox roseoaxillaris	2,500-9,999[120]	VU[120]	[120]
Malaita Boobook	Athene malaitae	2,500-9,999[121]	VU[121]	[121]
Mantanani scops owl	Otus mantananensis	?[122]	LC[122]	[122]
Maned owl	Jubula lettii	?[123]	DD[123]	[123]
Manus boobook	Ninox meeki	?[124]	LC[124]	[124]
Manus masked owl	Tyto manusi	?[125]	LC[125]	[125]	This subspecies is included under Tyto novaehollandiae. Population estimates are not given.[125]
Marsh owl	Asio capensis	?[126]	LC[126]	[126]
Mayotte scops owl	Otus mayottensis	?[127]	LC[127]	[127]
Mentawai scops owl	Otus mentawi	10,000-19,999[128]	LC[128]	[128]
Middle American screech owl	Megascops guatemalae	?[129]	LC[129]	[129]
Minahasa masked owl	Tyto inexspectata	?[130]	LC[130]	[130]
Mindanao boobook	Ninox spilocephala	?[131]	NT[131]	[131]
Mindanao scops owl	Otus mirus	?[132]	LC[132]	[132]
Mindoro boobook	Ninox mindorensis	2500-25000 (best estimate: 2500-9999)[133]	VU[133]	[133]
Mindoro scops owl	Otus mindorensis	10,000-19,999[134]	NT[134]	[134]
Moheli scops owl	Otus moheliensis	260[135]	EN[135]	[135]
Moluccan masked owl	Tyto novaehollandiae	?[136]	LC[136]	[136]
Moluccan scops owl	Otus magicus	?[137]	LC[137]	[137]
Morepork	Ninox novaeseelandiae	?[138]	LC[138]	[138]
Mottled owl	Strix virgata	?[139]	LC[139]	[139]
Mottled wood owl	Strix ocellata	?[140]	LC[140]	[140]
Mountain pygmy owl	Glaucidium gnoma	?[141]	LC[141]	[141]
Mountain scops owl	Otus spilocephalus	?[142]	LC[142]	[142]
Negros scops owl	Otus nigrorum	1,000-2,499[143]	VU[143]	[143]
New Britain boobook	Ninox odiosa	10,000-19,999[144]	VU[144]	[144]
New Ireland boobook	Ninox variegata	?[145]	LC[145]	[145]
Nicobar scops owl	Otus alius	2,500-9,999[146]	NT[146]	[146]
Northern boobook	Ninox japonica	?[147]	LC[147]	[147]
Northern hawk-owl	Surnia ulula	100,000-499,999[148]	LC[148]	[148]
Northern pygmy owl	Glaucidium californicum	?[149]	LC[149]	[149]
Northern saw-whet owl	Aegolius acadicus	2,000,000[150]	LC[150]	[150]
Northern white-faced owl	Ptilopsis leucotis	?[151]	LC[151]	[151]
Ochre-bellied boobook	Ninox ochracea	10,000-19,999[152]	NT[152]	[152]
Omani owl	Strix butleri	?[153]	LC[153]	[153]
Oriental bay owl	Phodilus badius	?[154]	LC[154]	[154]
Oriental scops owl	Otus sunia	?[155]	LC[155]	[155]
Pacific pygmy owl	Glaucidium peruanum	?[156]	LC[156]	[156]
Pacific screech owl	Megascops cooperi	50,000-499,999[157]	LC[157]	[157]
Palawan scops owl	Otus fuliginosus	10,000-19,999[158]	LC[158]	[158]
Pallid scops owl	Otus brucei	?[159]	LC[159]	[159]
Pemba scops owl	Otus pembaensis	3,000[160]	VU[160]	[160]
Pernambuco pygmy owl	Glaucidium mooreorum	0-49[161]	CR[161]	[161]	Maximum estimate; possibly extinct.[161]
Philippine eagle-owl	Bubo philippensis	2,500-9,999[162]	VU[162]	[162]
Powerful owl	Ninox strenua	2,200-2,800[163]	LC[163]	[163]
Principe Scops-owl	Otus bikegila	1,149-1,597[164]	CR[164]	[164]
Red owl	Tyto soumagnei	2,500-9,999[165]	VU[165]	[165]
Rote Boobook	Ninox rotiensis	500-5,000[166]	NT[166]	[166]
Rufescent screech-owl	Megascops ingens	?[167]	LC[167]	[167]
Rufous fishing owl	Scotopelia ussheri	2,500-9,999[168]	VU[168]	[168]
São Tomé scops owl	Otus hartlaubi	250-999[169]	VU[169]	[169]
Serendib scops owl	Otus thilohoffmanni	150-700[170]	EN[170]	[170]
Seychelles Scops-owl	Otus insularis	200-280[171]	CR[171]	[171]
Shelley's eagle-owl	Bubo shelleyi	1,500-7,000[172]	VU[172]	[172]
Short-eared owl	Asio flammeus	1,200,000-2,100,000[173]	LC[173]	[173]
Siau scops owl	Otus siaoensis	1-49[174]	CR[174]	[174]
Simeulue scops owl	Otus umbra	? [175]	LC[175]	[175]
Snowy owl	Bubo scandiaca	14,000-28,000[176]	VU[176]	[176]
Sokoke scops owl	Otus ireneae	2,500-9,999[177]	EN[177]	[177]
Spectacled owl	Pulsatrix perspicillata	?[178]	LC[178]	[178]
Spotted owl	Strix occidentalis	15,000[179]	NT[179]	[179]
Striped owl	Pseudoscops clamator	500,000-4,999,999[180]	LC[180]	[180]
Stygian owl	Asio stygius	?[181]	LC[181]	[181]
Sula scops-owl	Otus sulaensis	?[182]	NT[182]	[182]
Sumba boobook	Ninox rudolfi	6,000-15,000[183]	NT[183]	[183]
Taliabu masked owl	Tyto nigrobrunnea	250-999[184]	VU[184]	[184]
Tamaulipas pygmy owl	Glaucidium sanchezi	20,000 – 49,999[185]	NT[185]	[185]
Tanimbar bookbook	Ninox forbesi	12,000 – 48,000[186]	LC[186]	[186]
Tawny owl	Strix aluco	1,000,000-2,999,999[187]	LC[187]	[187]
Timor bookbook	Ninox fusca	? [188]	LC[188]	[188]
Togian boobook	Ninox burhani	2,100-8,100[189]	NT[189]	[189]
Unspotted saw-whet owl	Aegolius ridgwayi	?[190]	LC[190]	[190]
Ural owl	Strix uralensis	640,000-1,052,000[191]	LC[191]	[191]
Usambara eagle-owl	Bubo vosseleri	?[192]	LC[192]	[192]	This subspecies is included under Bubo poensis.[192]
White-fronted scops owl	Otus sagittatus	2,500-9,999[193]	VU[193]	[193]
White-throated screech-owl	Megascops albogularis	?[194]	LC[194]	[194]

See also

• Biology portal
• Birds portal

• Lists of birds by population
• Lists of organisms by population

References

1. Hume, Julian P. (24 August 2017). Extinct Birds. Bloomsbury. ISBN 978-1-4729-3745-2.
2. "Ninox albifacies". IUCN Red List of Threatened Species. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689496A93232295.en.
3. "Mascarenotus sauzieri". IUCN Red List of Threatened Species. doi:10.2305/IUCN.UK.2016-3.RLTS.T22728861A94999192.en.
4. "Mascarenotus grucheti". IUCN Red List of Threatened Species. doi:10.2305/IUCN.UK.2017-3.RLTS.T22728866A119424909.en.
5. "Mascarenotus murivorus". IUCN Red List of Threatened Species. doi:10.2305/IUCN.UK.2016-3.RLTS.T22728856A94999047.en.
6. BirdLife International (2016). "Asio abyssinicus". IUCN Red List of Threatened Species. 2016 e.T22689512A93233846. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689512A93233846.en.
7. BirdLife International. (2017) [amended version of 2016 assessment]. "Glaucidium capense". IUCN Red List of Threatened Species. 2017 e.T22689290A111870445. doi:10.2305/IUCN.UK.2017-1.RLTS.T22689290A111870445.en. Retrieved 1 July 2024.
8. BirdLife International (2016). "Tyto capensis". IUCN Red List of Threatened Species. 2016 e.T22688514A93199287. doi:10.2305/IUCN.UK.2016-3.RLTS.T22688514A93199287.en.
9. BirdLife International. (2024). "Otus senegalensis". IUCN Red List of Threatened Species. 2024 e.T61914670A264064037. doi:10.2305/IUCN.UK.2024-2.RLTS.T61914670A264064037.en.
10. BirdLife International (2016). "Strix woodfordii". IUCN Red List of Threatened Species. 2016 e.T22689166A93220349. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689166A93220349.en.
11. BirdLife International (2018). "Bubo leucostictus". IUCN Red List of Threatened Species. 2018 e.T22688996A130156693. doi:10.2305/IUCN.UK.2018-2.RLTS.T22688996A130156693.en.
12. BirdLife International (2022). "Glaucidium albertinum". IUCN Red List of Threatened Species. 2022 e.T22689310A208604278. doi:10.2305/iucn.uk.2022-1.rlts.t22689310a208604278.en.
13. BirdLife International (2023). "Ninox plesseni". IUCN Red List of Threatened Species. 2023 e.T230087117A233595835. doi:10.2305/IUCN.UK.2023-1.RLTS.T230087117A233595835.en.
14. BirdLife International (2018). "Glaucidium hardyi". IUCN Red List of Threatened Species. 2018 e.T22689234A130162570. doi:10.2305/IUCN.UK.2018-2.RLTS.T22689234A130162570.en.
15. BirdLife International (2017). "Ninox affinis". IUCN Red List of Threatened Species. 2017 e.T22689420A118443805. doi:10.2305/IUCN.UK.2017-3.RLTS.T22689420A118443805.en.
16. BirdLife International (2017). "Otus balli". IUCN Red List of Threatened Species. 2017 e.T22688573A118257284. doi:10.2305/IUCN.UK.2017-3.RLTS.T22688573A118257284.en.
17. BirdLife International (2016). "Glaucidium jardinii". IUCN Red List of Threatened Species. 2016 e.T22689222A93223061. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689222A93223061.en.
18. BirdLife International (2017). "Otus capnodes". IUCN Red List of Threatened Species. 2017 e.T22688686A119090936. doi:10.2305/iucn.uk.2017-3.rlts.t22688686a119090936.en.
19. BirdLife International. (2018) [amended version of 2017 assessment]. "Otus feae". IUCN Red List of Threatened Species. 2018 e.T61915272A125407816. doi:10.2305/IUCN.UK.2017-1.RLTS.T61915272A125407816.en. Retrieved 1 July 2024.
20. "BirdLife International. 2022. Bubo milesi. The IUCN Red List of Threatened Species 2022: e.T216709635A217222538". IUCN Red List of Threatened Species. 2022. 2022.
21. BirdLife International. (2017) [amended version of 2016 assessment]. "Otus pamelae". IUCN Red List of Threatened Species. 2017 e.T61915442A113016319. doi:10.2305/IUCN.UK.2017-1.RLTS.T61915442A113016319.en. Retrieved 1 July 2024.
22. BirdLife International (2016). "Tyto glaucops". IUCN Red List of Threatened Species. 2016 e.T22688511A93199076. doi:10.2305/IUCN.UK.2016-3.RLTS.T22688511A93199076.en.
23. BirdLife International (2016). "Glaucidium cuculoides". IUCN Red List of Threatened Species. 2016 e.T22689277A93224900. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689277A93224900.en.
24. BirdLife International (2016). "Glaucidium nana". IUCN Red List of Threatened Species. 2016 e.T22689258A93224043. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689258A93224043.en.
25. BirdLife International (2023). "BirdLife International. 2023. Ninox boobook". IUCN Red List of Threatened Species. 2023 e.T230075506A233533676. doi:10.2305/IUCN.UK.2023-1.RLTS.T230075506A233533676.en.
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27. BirdLife International (2016). "Glaucidium hoskinsii". IUCN Red List of Threatened Species. 2016 e.T61791676A95181434. doi:10.2305/IUCN.UK.2016-3.RLTS.T61791676A95181434.en.
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29. BirdLife International (2018). "Pulsatrix melanota". IUCN Red List of Threatened Species. 2018 e.T22689183A130161594. doi:10.2305/IUCN.UK.2018-2.RLTS.T22689183A130161594.en.
30. BirdLife International (2023). "Otus mendeni". IUCN Red List of Threatened Species. 2023 e.T62290488A209661225. doi:10.2305/IUCN.UK.2023-1.RLTS.T62290488A209661225.en.
31. "Margarobyas lawrencii". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22688883A93210507.en.
32. "Megascops clarkii". IUCN Red List of Threatened Species. 2022. 2022. doi:10.2305/IUCN.UK.2022-2.RLTS.T22688799A167851776.en.
33. "Ninox connivens". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689394A93229752.en.
34. BirdLife International. (2019) [amended version of 2016 assessment]. "Tyto alba". IUCN Red List of Threatened Species. 2019 e.T22688504A155542941. doi:10.2305/IUCN.UK.2019-3.RLTS.T22688504A155542941.en. Retrieved 1 July 2024.
35. "Bubo sumatranus". IUCN Red List of Threatened Species. doi:10.2305/IUCN.UK.2022-1.RLTS.T22688976A207944973.en.
36. "Strix varia". IUCN Red List of Threatened Species. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689094A93217844.en.
37. BirdLife International (2020). "Megascops barbarus". IUCN Red List of Threatened Species. 2020 e.T22688807A180130085. doi:10.2305/iucn.uk.2020-3.rlts.t22688807a180130085.en.
38. BirdLife International (2023). "Otus beccarii". IUCN Red List of Threatened Species. 2023 e.T22724754A223084666. doi:10.2305/IUCN.UK.2023-1.RLTS.T22724754A223084666.en.
39. BirdLife International (2018). "Ciccaba nigrolineata". IUCN Red List of Threatened Species. 2018 e.T22689133A130159025. doi:10.2305/iucn.uk.2018-2.rlts.t22689133a130159025.en.
40. "Ciccaba huhula". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689144A93219904.en.
41. "Megascops atricapilla". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22731897A95038543.en.
42. BirdLife International (2016). "Bubo blakistoni". IUCN Red List of Threatened Species. 2016 e.T22689007A93214159. doi:10.2305/iucn.uk.2016-3.rlts.t22689007a93214159.en.
43. BirdLife International (2021). "Aegolius funereus". IUCN Red List of Threatened Species. 2021 e.T22689362A201898946. doi:10.2305/iucn.uk.2021-3.rlts.t22689362a201898946.en.
44. "Ninox scutulata". IUCN Red List of Threatened Species. 2021. 2021. doi:10.2305/IUCN.UK.2021-3.RLTS.T22725643A200685229.en.
45. "Ketupa zeylonensis". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689012A90010491.en.
46. "Strix leptogrammica". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689071A93217052.en.
47. "Aegolius harrasii". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689378A93229112.en.
48. "Ketupa ketupu". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689024A93214791.en.
49. "Athene cunicularia". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689353A93227732.en.
50. "Ninox hantu". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22727909A94965479.en.
51. BirdLife International. (2022). "Ninox leventisi". IUCN Red List of Threatened Species. 2022 e.T22725512A208503262. doi:10.2305/IUCN.UK.2022-1.RLTS.T22725512A208503262.en.
52. "Bubo capensis". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22688944A93212047.en.
53. BirdLife International. (2022). "Ninox rumseyi". IUCN Red List of Threatened Species. 2022 e.T22725505A208960267. doi:10.2305/IUCN.UK.2022-1.RLTS.T22725505A208960267.en.
54. BirdLife International (2016). "Glaucidium griseiceps". IUCN Red List of Threatened Species. 2016 e.T22729012A95003178. doi:10.2305/iucn.uk.2016-3.rlts.t22729012a95003178.en.
55. BirdLife International. (2020) [amended version of 2018 assessment]. "Strix chacoensis". IUCN Red List of Threatened Species. 2020 e.T22733306A177165960. doi:10.2305/IUCN.UK.2020-3.RLTS.T22733306A177165960.en.
56. BirdLife International (2016). "Glaucidium castanotum". IUCN Red List of Threatened Species. 2016 e.T22689286A93225535. doi:10.2305/iucn.uk.2016-3.rlts.t22689286a93225535.en.
57. "Ninox randi". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22726321A94918597.en.
58. BirdLife International (2016). "Ninox natalis". IUCN Red List of Threatened Species. 2016 e.T22689452A93230899. doi:10.2305/iucn.uk.2016-3.rlts.t22689452a93230899.en.
59. BirdLife International (2022). "Ninox ios". IUCN Red List of Threatened Species. 2022 e.T22728610A207662764. doi:10.2305/iucn.uk.2022-1.rlts.t22728610a207662764.en.
60. "Megascops pertersoni". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22688840A93209725.en.
61. BirdLife International (2016). "Glaucidium nubicola". IUCN Red List of Threatened Species. 2016 e.T22724604A94873667. doi:10.2305/iucn.uk.2016-3.rlts.t22724604a94873667.en.
62. "Megascops marshalli". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22688847A93209893.en.
63. BirdLife International (2021). "Glaucidium palmarum". IUCN Red List of Threatened Species. 2021 e.T22729019A152211515. doi:10.2305/iucn.uk.2021-3.rlts.t22729019a152211515.en.
64. "Glaucidium brodiei". IUCN Red List of Threatened Species. 2021. 2021. doi:10.2305/IUCN.UK.2021-3.RLTS.T200290653A206387811.en.
65. BirdLife International. (2024). "Otus lettia". IUCN Red List of Threatened Species. 2024 e.T61855318A264055331. doi:10.2305/IUCN.UK.2024-2.RLTS.T61855318A264055331.en.
66. BirdLife International (2016). "Megascops colombianus". IUCN Red List of Threatened Species. 2016 e.T22688829A93209510. doi:10.2305/iucn.uk.2016-3.rlts.t22688829a93209510.en.
67. BirdLife International (2016). "Phodilus prigoginei". IUCN Red List of Threatened Species. 2016 e.T22688529A93199883. doi:10.2305/iucn.uk.2016-3.rlts.t22688529a93199883.en.
68. "Glaucidium costaricanum". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22729005A95003007.en.
69. BirdLife International (2018). "Lophostrix cristata". IUCN Red List of Threatened Species. 2018 e.T22689177A130160501. doi:10.2305/iucn.uk.2018-2.rlts.t22689177a130160501.en.
70. "Glaucidium siju". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689262A93224271.en.
71. "Otus cyprius". IUCN Red List of Threatened Species. 2019. 2019. doi:10.2305/IUCN.UK.2019-3.RLTS.T155019839A155215276.en.
72. BirdLife International. (2024). "Strix hadorami". IUCN Red List of Threatened Species. 2024 e.T22689083A263595470. doi:10.2305/IUCN.UK.2024-2.RLTS.T22689083A263595470.en.
73. "Bubo coromandus". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22688992A93213395.en.
74. "Glaucidium minutissimum". IUCN Red List of Threatened Species. 2018. 2018. doi:10.2305/IUCN.UK.2018-2.RLTS.T22689240A130162980.en.
75. "Megascops asio". IUCN Red List of Threatened Species. 2019. 2019. doi:10.2305/IUCN.UK.2019-3.RLTS.T155660662A152331179.en.
76. BirdLife International. (2021). "Micrathene whitneyi". IUCN Red List of Threatened Species. 2021 e.T22689325A168847632. doi:10.2305/IUCN.UK.2021-3.RLTS.T22689325A168847632.en.
77. BirdLife International. (2023). "Otus enganensis". IUCN Red List of Threatened Species. 2023 e.T22724390A226422700. doi:10.2305/IUCN.UK.2023-1.RLTS.T22724390A226422700.en.
78. BirdLife International. (2017) [amended version of 2016 assessment]. "Bubo bubo". IUCN Red List of Threatened Species. 2017 e.T22688927A113569670. doi:10.2305/IUCN.UK.2017-1.RLTS.T22688927A113569670.en.
79. BirdLife International (2016). "Glaucidium passerinum". IUCN Red List of Threatened Species. 2016 e.T22689194A86868363. doi:10.2305/iucn.uk.2016-3.rlts.t22689194a86868363.en.
80. BirdLife International (2021). "Otus scops". IUCN Red List of Threatened Species. 2021 e.T155019854A206523296. doi:10.2305/iucn.uk.2021-3.rlts.t155019854a206523296.en.
81. "Otus everetti". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22725053A94884958.en.
82. "Nesasio solomonensis". IUCN Red List of Threatened Species. 2023. 2023. doi:10.2305/IUCN.UK.2023-1.RLTS.T22689539A227316153.en.
83. "Glaucidium brasilianum". IUCN Red List of Threatened Species. 2022. 2022.
84. "Psiloscops flammeolus". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22688637A93203659.en.
85. "Otus alfredi". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22724396A94864662.en.
86. BirdLife International (2018). "Heteroglaux blewitti". IUCN Red List of Threatened Species. 2018 e.T22689335A132251554. doi:10.2305/iucn.uk.2018-2.rlts.t22689335a132251554.en.
87. "Fraser's eagle owl". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22730030A95023684.en.
88. BirdLife International (2016). "Strix fulvescens". IUCN Red List of Threatened Species. 2016 e.T22689097A93218072. doi:10.2305/iucn.uk.2016-3.rlts.t22689097a93218072.en.
89. BirdLife International. (2017) [amended version of 2016 assessment]. "Otus gurneyi". IUCN Red List of Threatened Species. 2017 e.T22688911A110372685. doi:10.2305/IUCN.UK.2017-1.RLTS.T22688911A110372685.en.
90. BirdLife International (2018). "Tyto aurantia". IUCN Red List of Threatened Species. 2018 e.T22688470A132059362. doi:10.2305/iucn.uk.2018-2.rlts.t22688470a132059362.en.
91. BirdLife International (2021). "Strix nebulosa". IUCN Red List of Threatened Species. 2021 e.T22689118A199144259. doi:10.2305/iucn.uk.2021-3.rlts.t22689118a199144259.en.
92. BirdLife International. (2018). "Bubo virginianus". IUCN Red List of Threatened Species. 2018 e.T61752071A132039486. doi:10.2305/IUCN.UK.2018-2.RLTS.T61752071A132039486.en.
93. BirdLife International (2016). "Tyto tenebricosa. The IUCN Red List of Threatened Species 2016". IUCN Red List of Threatened Species. 2016.
94. "Bubo cinerascens". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T61741660A95178482.en.
95. "Glaucidium cobanense". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T61791597A95181252.en.
96. "Ninox hypogramma". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22727900A94965298.en.
97. "Strix nivicolum". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22725477A94893250.en.
98. "Ninox obscura". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22726328A94918968.en.
99. "Bubo bengalensis". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22688934A93211525.en.
100. "Otus bakkamoena". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T61855263A95182096.en.
101. "Phodilus prigoginei". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22688529A93199883.en.
102. "Pseudoscops grammicus". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689501A93232472.en.
103. "Otus semitorques". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T61859151A95233778.en.
104. "Glacidium castanopterum". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689280A93225162.en.
105. BirdLife International (2016). "Otus angelinae". IUCN Red List of Threatened Species. 2016 e.T22688591A93201974. doi:10.2305/iucn.uk.2016-3.rlts.t22688591a93201974.en.
106. "Glaucidium radiatum". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689283A93225315.en.
107. BirdLife International (2021). "Otus pauliani". IUCN Red List of Threatened Species. 2021 e.T22688694A179586821. doi:10.2305/iucn.uk.2021-3.rlts.t22688694a179586821.en.
108. "Megascops koepckeae". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22688782A93208561.en.
109. BirdLife International (2017). "Ninox sumbaensis". IUCN Red List of Threatened Species. 2017 e.T22730062A118629788. doi:10.2305/iucn.uk.2017-3.rlts.t22730062a118629788.en.
110. "Bubo magellanicus". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T61752097A95179224.en.
111. BirdLife International (2016). "Tyto multipunctata". IUCN Red List of Threatened Species. 2016 e.T22688435A93197565.
112. Higgins, P. J. (1999). Handbook of Australian, New Zealand and Antarctic birds: parrots to dollarbids. Oxford, U.K.: Oxford University Press.
113. BirdLife International. (2019) [amended version of 2018 assessment]. "Athene noctua". IUCN Red List of Threatened Species. 2019 e.T22689328A155470112. doi:10.2305/IUCN.UK.2019-3.RLTS.T22689328A155470112.en.
114. BirdLife International (2021). "Asio otus". IUCN Red List of Threatened Species. 2021 e.T22689507A201150685. doi:10.2305/iucn.uk.2021-3.rlts.t22689507a201150685.en.
115. "Megascops sanctaecatarinae". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22688874A93210328.en.
116. BirdLife International (2020). "Xenoglaux loweryi". IUCN Red List of Threatened Species. 2020 e.T22689320A180768478. doi:10.2305/iucn.uk.2020-3.rlts.t22689320a180768478.en.
117. "Ninox philippensis". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22725483A94893562.en.
118. "Otus longicornis". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22688602A93202286.en.
119. "Asio madagascariensis". IUCN Red List of Threatened Species. 2018. 2018. doi:10.2305/IUCN.UK.2018-2.RLTS.T22689517A130164463.en.
120. "Ninox roseoaxillaris". IUCN Red List of Threatened Species. 2023. 2023. doi:10.2305/IUCN.UK.2023-1.RLTS.T45449334A157834363.en.
121. BirdLife International. (2023). "Ninox malaitae". IUCN Red List of Threatened Species. 2023 e.T45449331A209059576. doi:10.2305/IUCN.UK.2023-1.RLTS.T45449331A209059576.en.
122. BirdLife International (2023). "Otus mantananensis". IUCN Red List of Threatened Species. 2023 e.T22688656A226893897. doi:10.2305/IUCN.UK.2023-1.RLTS.T22688656A226893897.en.
123. "Jubula lettii". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689173A93220733.en.
124. "Ninox meeki". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689465A93231357.en.
125. BirdLife International (2018). "Tyto novaehollandiae". IUCN Red List of Threatened Species. 2018 e.T62172196A132190206. doi:10.2305/iucn.uk.2018-2.rlts.t62172196a132190206.en.
126. "Asio capensis". IUCN Red List of Threatened Species. 2021. 2021. doi:10.2305/IUCN.UK.2021-3.RLTS.T22689535A202174205.en.
127. "Otus mayottensis". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22732599A95047769.en.
128. BirdLife International (2023). "Otus mentawi". IUCN Red List of Threatened Species. 2023 e.T22688713A229809425. doi:10.2305/IUCN.UK.2023-1.RLTS.T22688713A229809425.en.
129. BirdLife International (2016). "Megascops guatemalae". IUCN Red List of Threatened Species. 2016 e.T61767847A95179450. doi:10.2305/iucn.uk.2016-3.rlts.t61767847a95179450.en.
130. BirdLife International (2023). "Tyto inexspectata". IUCN Red List of Threatened Species. 2023 e.T22688441A230036968. doi:10.2305/IUCN.UK.2023-1.RLTS.T22688441A230036968.en.
131. BirdLife International. (2023). "Ninox spilocephala". IUCN Red List of Threatened Species. 2023 e.T22728252A231065626. doi:10.2305/IUCN.UK.2023-1.RLTS.T22728252A231065626.en.
132. "Otus mirus". IUCN Red List of Threatened Species. 2023. 2023. doi:10.2305/IUCN.UK.2023-1.RLTS.T22688614A231090375.en.
133. BirdLife International. (2024). "Ninox mindorensis". IUCN Red List of Threatened Species. 2024 e.T22726334A226893163. doi:10.2305/IUCN.UK.2024-2.RLTS.T22726334A226893163.en.
134. BirdLife International (2016). "Otus mindorensis". IUCN Red List of Threatened Species. 2016 e.T22688608A93202581. doi:10.2305/iucn.uk.2016-3.rlts.t22688608a93202581.en.
135. BirdLife International (2017). "Otus moheliensis". IUCN Red List of Threatened Species. 2017 e.T22724585A118472254. doi:10.2305/iucn.uk.2017-3.rlts.t22724585a118472254.en.
136. BirdLife International. (2023). "Tyto novaehollandiae". IUCN Red List of Threatened Species. 2023 e.T230023167A230808865. doi:10.2305/IUCN.UK.2023-1.RLTS.T230023167A230808865.en.
137. "Otus magicus". IUCN Red List of Threatened Species. 2022. 2022. doi:10.2305/IUCN.UK.2022-2.RLTS.T219588044A219587839.en.
138. "Ninox novaeseelandiae". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T62023843A95186187.en.
139. BirdLife International (2016). "Ciccaba virgata". IUCN Red List of Threatened Species. 2016 e.T22689122A93219321. doi:10.2305/iucn.uk.2016-3.rlts.t22689122a93219321.en.
140. "Strix ocellata". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689066A93216851.en.
141. "Glaucidium gnoma". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T61791135A95180896.en.
142. "Otus spilocephalus". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22688579A93201511.en.
143. BirdLife International. (2017) [amended version of 2017 assessment]. "Otus nigrorum". IUCN Red List of Threatened Species. 2017 e.T22725062A119425323. doi:10.2305/IUCN.UK.2017-3.RLTS.T22725062A119425323.en.
144. BirdLife International (2018). "Ninox odiosa". IUCN Red List of Threatened Species. 2018 e.T22689480A132060613. doi:10.2305/iucn.uk.2018-2.rlts.t22689480a132060613.en.
145. BirdLife International. (2018). "Ninox variegata". IUCN Red List of Threatened Species. 2018 e.T22689475A130164063. doi:10.2305/IUCN.UK.2018-2.RLTS.T22689475A130164063.en.
146. "Otus alius". IUCN Red List of Threatened Species. 2019. 2019. doi:10.2305/IUCN.UK.2019-3.RLTS.T22728447A152511952.en.
147. "Ninox japonica". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22725653A94898452.en.
148. BirdLife International (2021). "Surnia ulula". IUCN Red List of Threatened Species. 2021 e.T22689189A206518616. doi:10.2305/iucn.uk.2021-3.rlts.t22689189a206518616.en.
149. "Glaucidium californicum". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T61791401A95181072.en.
150. "Aegolius acadicus". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689366A93228694.en.
151. "Ptilopsis leucotis". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T61781834A95179876.en.
152. BirdLife International. (2017) [amended version of 2016 assessment]. "Ninox ochracea". IUCN Red List of Threatened Species. 2017 e.T22689439A119424363. doi:10.2305/IUCN.UK.2017-3.RLTS.T22689439A119424363.en.
153. "Strix butleri". IUCN Red List of Threatened Species. 2021. 2021. doi:10.2305/IUCN.UK.2021-3.RLTS.T62290760A189658549.en.
154. "Phodilus badius". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22727641A94955098.en.
155. "Otus sunia". IUCN Red List of Threatened Species. 2021. 2021. doi:10.2305/IUCN.UK.2021-3.RLTS.T22728969A206482277.en.
156. "Glaucidium peruanum". IUCN Red List of Threatened Species. 2016. 2016. doi:10.2305/IUCN.UK.2016-3.RLTS.T22689253A93223829.en.
157. BirdLife International (2021). "Megascops cooperi". IUCN Red List of Threatened Species. 2021 e.T155658784A167849084. doi:10.2305/iucn.uk.2021-3.rlts.t155658784a167849084.en.
158. BirdLife International (2023). "Otus fuliginosus". IUCN Red List of Threatened Species. 2023 e.T22688718A229775192. doi:10.2305/IUCN.UK.2023-1.RLTS.T22688718A229775192.en.
159. BirdLife International (2021). "Otus brucei". IUCN Red List of Threatened Species. 2021 e.T22688631A206478716. doi:10.2305/IUCN.UK.2021-3.RLTS.T22688631A206478716.en.
160. BirdLife International (2016). "Otus pembaensis". IUCN Red List of Threatened Species. 2016 e.T22688679A93205686. doi:10.2305/iucn.uk.2016-3.rlts.t22688679a93205686.en.
161. BirdLife International (2019). "Glaucidium mooreorum". p. e.T22733081A156084939. doi:10.2305/iucn.uk.2019-3.rlts.t22733081a156084939.en.
162. BirdLife International (2016). "Bubo philippensis". IUCN Red List of Threatened Species. 2016 e.T22689002A93213848. doi:10.2305/iucn.uk.2016-3.rlts.t22689002a93213848.en.
163. BirdLife International (2016). "Ninox strenua". IUCN Red List of Threatened Species. 2016 e.T22689389A93229550. doi:10.2305/iucn.uk.2016-3.rlts.t22689389a93229550.en.
164. BirdLife International (2023). "Otus bikegila". IUCN Red List of Threatened Species. 2023 e.T230025085A231652448. doi:10.2305/IUCN.UK.2023-1.RLTS.T230025085A231652448.en.
165. BirdLife International (2016). "Tyto soumagnei". IUCN Red List of Threatened Species. 2016 e.T22688493A93198777. doi:10.2305/iucn.uk.2016-3.rlts.t22688493a93198777.en.
166. BirdLife International (2023). "Ninox rotiensis". IUCN Red List of Threatened Species. 2023 e.T22725127A233595800. doi:10.2305/IUCN.UK.2023-1.RLTS.T22725127A233595800.en.
167. BirdLife International (2023). "Megascops ingens". IUCN Red List of Threatened Species. 2023 e.T232594776A232861395. doi:10.2305/IUCN.UK.2023-1.RLTS.T232594776A232861395.en.
168. BirdLife International (2021). "Scotopelia ussheri". IUCN Red List of Threatened Species. 2021 e.T22689038A180213988. doi:10.2305/iucn.uk.2021-3.rlts.t22689038a180213988.en.
169. BirdLife International (2018). "Otus hartlaubi". IUCN Red List of Threatened Species. 2018 e.T22688620A131460770. doi:10.2305/iucn.uk.2018-2.rlts.t22688620a131460770.en.
170. BirdLife International (2016). "Otus thilohoffmanni". IUCN Red List of Threatened Species. 2016 e.T22732040A95041044. doi:10.2305/iucn.uk.2016-3.rlts.t22732040a95041044.en.
171. BirdLife International (2021). "Otus insularis". IUCN Red List of Threatened Species. 2021 e.T22688667A177971497. doi:10.2305/IUCN.UK.2021-3.RLTS.T22688667A177971497.en.
172. BirdLife International (2018). "Bubo shelleyi". IUCN Red List of Threatened Species. 2018 e.T22688980A131104915. doi:10.2305/iucn.uk.2018-2.rlts.t22688980a131104915.en.
173. BirdLife International (2021). "Asio flammeus". IUCN Red List of Threatened Species. 2021 e.T22689531A202226582. doi:10.2305/iucn.uk.2021-3.rlts.t22689531a202226582.en.
174. BirdLife International (2018). "Otus siaoensis". IUCN Red List of Threatened Species. 2018 e.T22728599A134199532. doi:10.2305/iucn.uk.2018-2.rlts.t22728599a134199532.en.
175. BirdLife International (2023). "Otus umbra". IUCN Red List of Threatened Species. 2023 e.T22688586A229906969. doi:10.2305/IUCN.UK.2023-1.RLTS.T22688586A229906969.en.
176. BirdLife International (2021). "Bubo scandiacus". IUCN Red List of Threatened Species. 2021 e.T22689055A205475036. doi:10.2305/iucn.uk.2021-3.rlts.t22689055a205475036.en.
177. BirdLife International (2016). "Otus ireneae". IUCN Red List of Threatened Species. 2016 e.T22688565A93201000. doi:10.2305/iucn.uk.2016-3.rlts.t22688565a93201000.en.
178. BirdLife International (2018). "Pulsatrix perspicillata". IUCN Red List of Threatened Species. 2018 e.T22689180A130161018. doi:10.2305/iucn.uk.2018-2.rlts.t22689180a130161018.en.
179. BirdLife International (2020). "Strix occidentalis". IUCN Red List of Threatened Species. 2020 e.T22689089A180937862. doi:10.2305/iucn.uk.2020-3.rlts.t22689089a180937862.en.
180. BirdLife International (2021). "Asio clamator". IUCN Red List of Threatened Species. 2021 e.T22689522A167863611. doi:10.2305/iucn.uk.2021-3.rlts.t22689522a167863611.en.
181. BirdLife International (2016). "Asio stygius". IUCN Red List of Threatened Species. 2016 e.T22689504A95214500. doi:10.2305/iucn.uk.2016-3.rlts.t22689504a95214500.en.
182. BirdLife International (2023). "Otus sulaensis". IUCN Red List of Threatened Species. 2023 e.T62290539A230014017. doi:10.2305/IUCN.UK.2023-1.RLTS.T62290539A230014017.en.
183. BirdLife International (2016). "Ninox rudolfi". IUCN Red List of Threatened Species. 2016 e.T22689398A93229974. doi:10.2305/iucn.uk.2016-3.rlts.t22689398a93229974.en.
184. BirdLife International. (2024). "Tyto nigrobrunnea". IUCN Red List of Threatened Species. 2024 e.T22688449A255584128. doi:10.2305/IUCN.UK.2024-2.RLTS.T22688449A255584128.en.
185. BirdLife International (2019). "Glaucidium sanchezi". IUCN Red List of Threatened Species. 2019 e.T22724465A156097322. doi:10.2305/iucn.uk.2019-3.rlts.t22724465a156097322.en.
186. BirdLife International (2023). "Ninox forbesi". IUCN Red List of Threatened Species. 2023 e.T22727916A218489749. doi:10.2305/IUCN.UK.2023-1.RLTS.T22727916A218489749.en.
187. BirdLife International (2016). "Strix aluco". IUCN Red List of Threatened Species. 2016 e.T22725469A86871093. doi:10.2305/iucn.uk.2016-3.rlts.t22725469a86871093.en.
188. BirdLife International (2023). "Ninox fusca". IUCN Red List of Threatened Species. 2023 e.T230084345A233564880. doi:10.2305/IUCN.UK.2023-1.RLTS.T230084345A233564880.en.
189. BirdLife International. (2023). "Ninox burhani". IUCN Red List of Threatened Species. 2023 e.T22732909A223348997. doi:10.2305/IUCN.UK.2023-1.RLTS.T22732909A223348997.en.
190. BirdLife International (2016). "Aegolius ridgwayi". IUCN Red List of Threatened Species. 2016 e.T22689371A93228935. doi:10.2305/iucn.uk.2016-3.rlts.t22689371a93228935.en.
191. BirdLife International (2021). "Aegolius ridgwayi". IUCN Red List of Threatened Species. 2021 e.T22689108A199908915. doi:10.2305/IUCN.UK.2021-3.RLTS.T22689108A199908915.en.
192. BirdLife International (2016). "Bubo poensis". IUCN Red List of Threatened Species. 2016 e.T22730030A95023684. doi:10.2305/iucn.uk.2016-3.rlts.t22730030a95023684.en.
193. BirdLife International. (2017) [amended version of 2016 assessment]. "Otus sagittatus". IUCN Red List of Threatened Species. 2017 e.T22688548A110219632. doi:10.2305/IUCN.UK.2017-1.RLTS.T22688548A110219632.en.
194. BirdLife International (2016). "Megascops albogularis". IUCN Red List of Threatened Species. 2016 e.T22688903A93211055. doi:10.2305/IUCN.UK.2016-3.RLTS.T22688903A93211055.en.