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 .
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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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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 .
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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 .
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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 .
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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 .
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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 .
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108. "Megascops koepckeae". IUCN Red List of Threatened Species . 2016. 2016. doi: 10.2305/IUCN.UK.2016-3.RLTS.T22688782A93208561.en .
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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.
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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 .
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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 .
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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 .