List of Strigiformes by population

From Wikipedia, the free encyclopedia

This is a list of Strigiformes species by global population. While numbers are estimates, they have been made by the experts in their fields. For more information on how these estimates were ascertained, see Wikipedia's articles on population biology and population ecology.

Not all Gruiformes have had their populations quantified, but species without population estimates are included in a secondary table below.

The IOC World Bird List (version 15.1) recognizes 254 species of Strigiformes, five of which are extinct.[1] This list follows IUCN classifications for species names and taxonomy. Where IUCN classifications differ from other ornithological authorities, alternative names and taxonomies are noted.

Some members of Strigiformes are extinct:

  • Bermuda saw-whet owl (Aegolius gradyi), described from fossil records and explorer accounts of the bird in the 17th century.[2]
  • Laughing owl (Ninox albifacies), last seen in 1914, may have been extant through 1920s.[3]
  • Mauritius scops owl or Mauritius owl (Otus sauzieri), last seen in 1837; extinct by 1859. IUCN/BirdLife International place species in genus Mascarenotus.[4]
  • Réunion scops owl or Réunion owl (Otus grucheti), went extinct in the 17th century after the colonization of the island of Réunion. IUCN/BirdLife International place species in genus Mascarenotus.[5]
  • Rodrigues scops owl or Rodrigues owl (Otus murivorus), last recorded in 1726. IUCN/BirdLife International place species in genus Mascarenotus.[6]
Common name Binomial name Population Status Trend Notes Image
Pernambuco pygmy owl Glaucidium mooreorum 0-49[7]CR[7] Decrease[7] May be extinct. Last seen in 2001.[7]
Siau scops owl Otus siaoensis 1-49[8]CR[8] Steady[8]
Seychelles scops owl Otus insularis 200-280[9]CR[9] Decrease[9]
Christmas Island boobook

(Christmas boobook)

 Ninox natalis 240-1,200[10]VU[10] Steady[10] Best estimate for number of mature individuals is 340.[10]
Forest owlet Athene blewitti 250-999[11]EN[11] Decrease[11]
Romblon boobook Ninox spilonotus 250-999[12] EN[12] Decrease[12]
Cebu boobook Ninox rumseyi 250-999[13]VU[13]Steady[13]
São Tomé scops owl Otus hartlaubi 250-999[14]VU[14] Decrease[14] Total population is estimated to be 350-1,500 individuals.[14]
Long-whiskered owlet Xenoglaux loweryi 250-999[15]VU[15] Steady[15] Total population is estimated to be 350-1,500 individuals.[15]
Camiguin boobook Ninox leventisi 250-1,400[16]VU[16]Steady[16] Best estimate for number of mature individuals is 250-999.[16]
Moheli scops owl Otus moheliensis 260[17]EN[17] Decrease[17]
Serendib scops owl Otus thilohoffmanni 400-1,000[18]EN[18] Decrease[18]
Rote boobook Ninox rotiensis 500-5,000[19]NT[19] Decrease[19]
Principe scops owl Otus bikegila 853-2,533[20]CR[20] Decrease[20] Best estimate for number of mature individuals is 1,149-1,597.[20]
Blakiston's eagle-owl

(Blakiston's fish owl)

 Ketupa blakistoni 900-1,700[21]VU[21] Decrease[21] Best estimate for number of mature individuals is 900-1,150.[21]

IUCN/BirdLife International place this species in genus Bubo.
Sokoke scops owl Otus ireneae 1,000-2,000[22]EN[22] Decrease[22]
Madagascar red owl

(Red owl)

 Tyto soumagnei 1,250-3,750[23]VU[23] Decrease[23]
Shelley's eagle-owl Bubo shelleyi 1,500-7,000[24]VU[24] Decrease[24] Total population is estimated to be 2,500-9,999 individuals.[24]
Cloud-forest pygmy owl Glaucidium nubicola 1,900-22,500[25]VU[25] Decrease[25] Best estimate for number of mature individuals is 2,500-9,999.[25]
Socotra scops owl Otus socotranus 2,000[26] LC[26] Steady[26] Total population is estimated to be 3,000 individuals.[26]
Togian boobook Ninox burhani 2,100-8,100[27]NT[27] Decrease[27]
Powerful owl Ninox strenua 2,200-2,800[28]LC[28] Steady[28] Total population is estimated to be 3,250-4,250 individuals.[28]
Grande Comore scops owl

(Karthala scops owl)

 Otus pauliani 2,300[29]EN[29] Decrease[29]
Anjouan scops owl Otus capnodes 2,300-3,600[30]EN[30] Decrease[30]
Santa Marta screech owl Megascops gilesi 2,300-7,500[31] VU[31] Decrease[31] Newly described species, as of 2017.[32]

Population has not been directly quantified, but is extrapolated using the population density of the congeneric tawny-bellied screech owl.[31]
Pemba scops owl Otus pembaensis 2,500-3,000[33]VU[33] Decrease[33]
Sulu boobook Ninox reyi 2,500-7,500[34] VU[34] Decrease[34]
Malaita owl Athene malaitae 2,500-9,999[35]VU[35] Decrease[35]
Makira owl Athene roseoaxillaris 2,500-9,999[36]VU[36] Decrease[36]
Flores scops owl Otus alfredi 2,500-9,999[37]VU[37]Decrease[37]
Rufous fishing owl Scotopelia ussheri 2,500-9,999[38]VU[38] Decrease[38]
Golden masked owl Tyto aurantia 2,500-9,999[39]VU[39] Decrease[39]
Albertine owlet Glaucidium albertinum 2,500-9,999[40]NT[40] Decrease[40] Total population is estimated to be 3,500-15,000 individuals.[40]
Fearful owl Nesasio solomonensis 2,500-9,999[41]NT[41] Decrease[41]
Nicobar scops owl Otus alius 2,500-9,999[42]NT[42]Decrease[42]
Javan scops owl Otus angelinae 2,500-9,999[43]NT[43] Decrease[43]
Rinjani scops owl Otus jolandae 2,500-9,999[44] NT[44] Steady[44]
Visayan scops owl

(Negros scops owl)

 Otus nigrorum 2,500-9,999[45]NT[45]Decrease[45]
Andaman boobook Ninox affinis 2,500-9,999[46]LC[46]Decrease[46]
Enggano scops owl Otus enganensis 2,500-9,999[47]LC[47] Steady[47]
Mindoro boobook Ninox mindorensis 2,500-25,000[48]VU[48]Decrease[48] Best estimate for number of mature individuals in 2,500-9,999.[48]
Lesser sooty owl Tyto multipunctata 4,000[49]LC[49] Steady[49] Estimated to be around 2,000 breeding pairs.[49][50]
Arabian eagle-owl Bubo milesi 4,000-9,999[51]LC[51]Steady[51]
Sumba boobook Ninox rudolfi 5,000-24,000[52]NT[52] Decrease[52] Best estimate for number of mature individuals is 5,000-15,000.[52]
Least boobook Ninox sumbaensis 10,000-19,999[53]EN[53] Decrease[53] Total population is estimated to be 15,000-30,000 individuals.[53]
New Britain boobook Ninox odiosa 10,000-19,999[54]VU[54] Decrease[54]
Guadalcanal owl Athene granti 10,000-19,999[55] NT[55] Decrease[55]
Palawan scops owl Otus fuliginosus 10,000-19,999[56]LC[56] Decrease[56]
Mentawai scops owl Otus mentawi 10,000-19,999[57]LC[57] Steady[57]
Chestnut-backed owlet Glaucidium castanonotum 10,000-20,000[58]NT[58] Decrease[58]
Cyprus scops owl Otus cyprius 10,000-24,000[59]LC[59]?[59] Total population is estimated to be 15,000-36,000 individuals.[59]
Banggai scops owl Otus mendeni 10,000-40,000[60]NT[60]Decrease[60]
Flammulated owl Psiloscops flammeolus 12,000[61]LC[61]?[61]
Tanimbar boobook Ninox forbesi 12,000-48,000[62]LC[62] Steady[62]
Snowy owl Bubo scandiacus 14,000-28,000[63]VU[63] Decrease[63]
Spotted owl Strix occidentalis 15,000[64]NT[64] Decrease[64]
Biak scops owl Otus beccarii 15,000-45,000[65]NT[65] Decrease[65] Best estimate for number of mature individuals is 15,000-20,000.[65]
Mindoro scops owl Otus mindorensis 15,750-44,000[66]NT[66] Decrease[66]
Tamaulipas pygmy owl Glaucidium sanchezi 20,000-49,999[67]NT[67] Decrease[67]
Colima pygmy owl Glaucidium palmarum 20,000-49,999[68]LC[68] Decrease[68]
Bearded screech owl Megascops barbarus 20,000-49,999[69]LC[69] Decrease[69]
Bare-shanked screech owl Megascops clarkii 20,000-49,999[70]LC[70]Steady[70]
Balsas screech owl Megascops seductus 20,000-49,999[71]LC[71] Decrease[71]
Unspotted saw-whet owl Aegolius ridgwayi 20,000-50,000[72]LC[72] Decrease[72]
Costa Rican pygmy owl Glaucidium costaricanum 20,000-50,000[73]LC[73]Steady[73]
Fulvous owl Strix fulvescens 20,000-50,000[74]LC[74] Decrease[74]
Great grey owl Strix nebulosa 50,000-99,999[75]LC[75] Increase[75]
Stygian owl Asio stygius 50,000-499,999[76]LC[76] Decrease[76]
Pacific screech owl Megascops cooperi 50,000-499,999[77]LC[77] Decrease[77]
Central American pygmy owl Glaucidium griseiceps 50,000-500,000[78]LC[78] Decrease[78]
Guatemalan screech owl

(Middle American screech owl)

 Megascops guatemalae 50,000-500,000[79]LC[79] Decrease[79] Note that IOC taxonomy splits two additional species from this one: Chocó screech owl (M. centralis) and foothill screech owl (M. roraimae).[1]

IUCN/BirdLife International maintain all three species within M. guatemalae.[80]
Arabian scops owl Otus pamelae 60,000[81]LC[81]Steady[81]
Elf owl Micrathene whitneyi 72,000[82]LC[82]Decrease[82]
Western screech owl Megascops kennicottii 73,000-230,000[83] LC[83] Decrease[83]
Northern hawk-owl Surnia ulula 100,000-499,999[84]LC[84] Steady[84]
Northern pygmy-owl

(Mountain pygmy-owl)

 Glaucidium gnoma 180,000[85]LC[85]Increase[85] Note that IOC taxonomy splits three additional species from this one: the northern (G. californicum), Guatemalan (G. cobanense), and Baja (G. hoskinsii) pygmy-owls.[1]

IUCN/BirdLife International maintain all four species within G. gnoma.[80]
Eurasian eagle-owl Bubo bubo 180,000-300,000[86]LC[86] Decrease[86]
Whiskered screech owl Megascops trichopsis 200,000[87] LC[87] Decrease[87]
Eurasian pygmy owl Glaucidium passerinum 471,000-894,000[88]LC[88] Steady[88]
Striped owl Asio clamator 500,000-4,999,999[89]LC[89] Decrease[89]
Tropical screech owl Megascops choliba 500,000-4,999,999[90] LC[90] Decrease[90]
Mottled owl Strix virgata 500,000-4,999,999[91]LC[91] Decrease[91] IUCN/BirdLife International place this species in genus Ciccaba.
Eastern screech owl Megascops asio 560,000[92]LC[92]Decrease[92]
Ural owl Strix uralensis 640,000-1,052,000[93]LC[93] Steady[93]
Boreal owl Aegolius funereus 730,000-1,810,000[94]LC[94] Steady[94]
Eurasian scops owl Otus scops 790,000-1,350,000[95]LC[95] Decrease[95]
Burrowing owl Athene cunicularia 1,000,000-9,999,999[96]LC[96]Steady[96]
Short-eared owl Asio flammeus 1,200,000-2,100,000[97]LC[97] Decrease[97]
Tawny owl Strix aluco 1,580,000-2,340,000[98]LC[98] Steady[98] Note that IOC taxonomy splits an additional species, the Maghreb owl (S. mauritanica) from this one.[1]

IUCN/BirdLife International maintain both species within S. aluco.[80]
Common barn owl

(Western barn owl)

 Tyto alba 1,960,000-3,240,000[99]LC[99] ?[99] Note that IOC taxonomy splits three additional species from this one: American barn owl (T. furcata), Eastern barn owl (T. javanica), and Andaman masked owl (T. deroepstorffi).[1]

IUCN/BirdLife International maintain all four species within T. alba.[80]
Northern saw-whet owl Aegolius acadicus 2,000,000[100]LC[100]Increase[100]
Long-eared owl Asio otus 2,200,000-3,700,000[101]LC[101] Decrease[101]
Barred owl Strix varia 3,000,000-3,900,000[102]LC[102]Increase[102] Note that IOC taxonomy splits an additional species, the cinereous owl (S. sartorii) from this one.[1]

IUCN/BirdLife International maintain both species within S. varia.[80]
Little owl Athene noctua 5,000,000-9,999,999[103]LC[103] Steady[103]
Great horned owl Bubo virginianus 5,700,000[104]LC[105]Steady[105] IUCN/BirdLife International do not report a population estimate.[105]

Value given comes from Partners in Flight database.[104]
Ferruginous pygmy owl Glaucidium brasilianum 20,000,000[106]LC[106]Decrease[106]

Species without population estimates

See also

References

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