List of Procellariiformes by population

This is a list of Procellariiformes 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.

The IOC World Bird List (version 15.1) recognizes 149 species of Procellariiformes, two of which are extinct.[1] As of January 2026, IUCN/BirdLife International have assessed 144 members, and provided population estimates for 143 members of the order. While not all Procellariiformes have population estimates, species with unknown populations are listed in a secondary table below.

This list follows IUCN classifications for species names and taxonomy. Where IUCN classifications differ from other ornithological authorities, alternative names and taxonomies are noted.

Two members of Procellariiformes are extinct:

Species by global population

Common name Binomial name Population Status Trend Notes Image
Fiji petrelPseudobulweria macgillivrayi1-49[4]CR[4]Decrease[4]Maximum estimate.[4]
Guadalupe storm petrelHydrobates macrodactylus1-49[5]CR[5]?[5]Maximum estimate; may be extinct.[5]
Jamaican petrelPterodroma caribbaea1-49[6]CR[6]?[6]Maximum estimate; may be extinct. Last confirmed observation in 1879.[6]
New Zealand storm petrelFregetta maoriana1-49[7]CR[7]?[7]Still seen in small numbers, as recently as 2013.[7]
Rapa shearwater Puffinus myrtae 50-249[8] CR[8] Decrease[8] Total population is estimated to be 75-375 individuals.[8]
Bryan's shearwater Puffinus bryani 50-249[9] CR[9] Decrease[9] Total population is estimated to be 70-380 individuals.[9]
Beck's petrelPseudobulweria becki50-249[10]CR[10]Decrease[10]Rediscovered in 2007. Total population is estimated to be 70-400 individuals.[10]
Magenta petrelPterodroma magentae80-100[11]CR[11]Increase[11]Total population is estimated to be 150-200 individuals.[11]
Amsterdam albatrossDiomedea amsterdamensis92[12]CR[12]Increase[12]46 total nesting pairs.[12]
Mascarene petrel Pseudobulweria aterrima 100-200[13] CR[13] Decrease[13] Population is most likely near the lower end of this estimate.[13]
Zino's petrelPterodroma madeira160[14]EN[14]Steady[14]Total population is estimated to be 200 individuals.[14]
Bermuda petrelPterodroma cahow196[15]EN[15]Increase[15]98 total nesting pairs.[15]
Whenua Hou diving-petrel Pelecanoides whenuahouensis 200[16] CR[16] Increase[16] Value given is estimated total number of adults.[16]
New Caledonian storm petrel Fregetta lineata 200-2,000[17] DD[17] ?[17] Species is very poorly known. Values are a best guess.[17]
Townsend's shearwaterPuffinus auricularis250-999[18]CR[18]Decrease[18]Total population is estimated to be 375-1,499 individuals.[18]
Heinroth's shearwaterPuffinus heinrothi250-999[19]VU[19]Steady[19]Total population is estimated to be 375-1,499 individuals.[19]
Monteiro's storm petrelHydrobates monteiroi250-999[20]VU[20]Steady[20]Total population is estimated to be 375-1,499 individuals.[20]
Desertas petrel Pterodroma deserta 250-999[21] VU[21] Steady[21] Total population is estimated to be 350-1,500 individuals.[21]
Collared petrelPterodroma brevipes670-6,700[22]VU[22]Decrease[22]Total population is estimated to be 1,000-10,000 individuals.[22]
Polynesian storm petrelNesofregetta fuliginosa1,000-1,600[23]EN[23]Decrease[23]Total population is estimated to be 1,500-2,400 individuals.[23]
Cape Verde petrel

(Fea's petrel)

 Pterodroma feae1,000-2,000[24]NT[24]?[24]Total population is estimated to be 1,500-3,000 individuals.[24]
Black-capped petrel Pterodroma hasitata 1,000-2,000[25] EN[25] Decrease[25] Total population is estimated to be 2,000-4,000 individuals.[25]
Chatham Islands petrelPterodroma axillaris1,100[26]VU[26]Increase[26]Total population is estimated to be 1,400 individuals.
Short-tailed albatrossPhoebastria albatrus1,734[27]VU[27]Increase[27]Total population is estimated to be 4,200 individuals.[27]
Pincoya storm petrel Oceanites pincoyae 2,000[28] DD[28] ?[28] Total population is estimated to be 3,000 individuals.[28]
Trindade petrelPterodroma arminjoniana2,260[29]VU[29]Steady[29]
White-winged petrel

(Gould's petrel)

 Pterodroma leucoptera2,000-14,000[30]VU[30]Decrease[30]Total population is estimated to be 3,000-21,000 individuals.[30]
Townsend's storm petrel Hydrobates socorroensis 2,500-9,999[31] EN[31] Decrease[31]
Ainley's storm petrel Hydrobates cheimomnestes 2,500-9,999[32] VU[32] Steady[32]
Jouanin's petrelBulweria fallax2,500-9,999[33]NT[33]?[33]
Tristan albatrossDiomedea dabbenena3,400-4,800[34]CR[34]Decrease[34]Total population is estimated to be 5,200-7,300 individuals.[34]
Ashy storm petrelHydrobates homochroa3,500-6,700[35]EN[35]Decrease[35]Total population is estimated to be 5,200-10,000 individuals.[35]
Black petrelProcellaria parkinsoni5,500[36]VU[36]Steady[36]Total population is estimated to be and 11,000 individuals.[36]
Masatierra petrelPterodroma defilippiana5,554[37]VU[37]Steady[37]Total population is expected to be less than 10,000 individuals.[37]
Galápagos petrelPterodroma phaeopygia6,000-15,000[38]CR[38]Decrease[38]Total population is estimated to be 10,000-19,999 individuals.[38]
Magellanic diving petrel Pelecanoides magellani 6,700-330,000[39] LC[39] Decrease[39] Total population is estimated to "number tens of thousands to hundreds of thousands of individuals."[39]
Hawaiian petrelPterodroma sandwichensis7,500-16,600[40]EN[40]Decrease[40]
Westland petrelProcellaria westlandica7,900-13,700[41]EN[41]?[41]
Newell's shearwaterPuffinus newelli10,000-19,999[42]CR[42]Decrease[42]Total population is estimated to be, at maximum, 27,000 individuals.[42]
Tahiti petrelPseudobulweria rostrata10,000-19,999[43]NT[43]Decrease[43]Total population is estimated to be 20,000-30,000 individuals.[43]
Persian shearwater Puffinus persicus >10,000[44] LC[44] Decrease[44]
Chatham albatrossThalassarche eremita11,000[45]VU[45]Steady[45]Total population is estimated to be 16,000 individuals.[45]
Pycroft's petrelPterodroma pycrofti12,000-22,000[46]VU[46]Increase[46]Total population is estimated to be 30,000-40,000 individuals.[46]
Cape Verde shearwaterCalonectris edwardsii13,800[47]NT[47]Decrease[47]Total population is estimated to be 24,000 individuals.[47]
Cape Verde storm petrel Hydrobates jabejabe 15,500-67,500[48] LC[48] Decrease[48]
Northern royal albatrossDiomedea sanfordi17,000[49]EN[49]Decrease[49]Total population is estimated to be 25,000-26,000 individuals.[49]
Balearic shearwaterPuffinus mauretanicus19,000[50]CR[50]Decrease[50]Total population is estimated to be 25,000 individuals.[50]
Spectacled petrelProcellaria conspicillata20,000[51]VU[51]Increase[51]Total population is estimated to be 31,000-45,000 individuals.[51]
Tristram's storm petrelHydrobates tristrami20,000[52]LC[52]Steady[52]Maximum estimate. Total population is estimated to be 30,000 individuals.[52]
Phoenix petrelPterodroma alba20,000-30,000[53]VU[53]Decrease[53]Preliminary estimate.[53]
Matsudaira's storm petrelHydrobates matsudairae>20,000[54]VU[54]?[54]Per BirdLife International, species is described as "not especially rare in the Indian Ocean, suggesting that the global population numbers a minimum of 20,000 individuals".[54]
Snowy albatross

(Wandering albatross)

 Diomedea exulans20,100[55]VU[55]Decrease[55]
Sooty albatrossPhoebetria fusca21,234-28,656[56]EN[56]Decrease[56]Estimate comes from a count of 10,617 - 14,328 breeding pairs.[56]
Northern giant petrelMacronectes halli23,600[57]LC[57]Increase[57]
Southern royal albatrossDiomedea epomophora27,200[58]VU[58]Steady[58]
Shy albatrossThalassarche cauta29,800-33,400[59]NT[59]Steady[59]Best estimate for number of mature individuals is 31,600.
Barau's petrelPterodroma baraui30,000-40,000[60]EN[60]Decrease[60]
Audubon's shearwater

(Sargasso shearwater)

 Puffinus lherminieri30,000-59,000[61]LC[61]Decrease[61]Note that IOC taxonomy splits an additional species, Boyd's shearwater, from this species (IOC splits from Barolo shearwater, which is maintained by IUCN as a subsepcies of little shearwater).[1]

IUCN/BirdLife International maintain both species within P. lherminieri.[62]
White-vented storm petrel

(Elliot's storm petrel)

 Oceanites gracilis>30,000[63]DD[63]?[63]Values given are for total population.[63]
Yelkouan shearwaterPuffinus yelkouan30,674-60,038[64]VU[64]Decrease[64]Estimate comes from a reported 15,337-30,519 pairs; estimated total population is 46,000-92,000 individuals. However, this may be an underestimate given counts of 75,000-90,000 individuals during migration through the Bosporus Strait as recently as 2015.[64]
Waved albatross Phoebastria irrorata 34,694[65] CR[65] Decrease[65] Value given is the most recent estimate for total population, from 2001. It is likely the population is now smaller.[65]
Galápagos shearwater Puffinus subalaris 35,000[66] LC[66] Decrease[66]
Atlantic yellow-nosed albatrossThalassarche chlororhynchos35,000-73,500[67]EN[67]Decrease[67]
Henderson petrel Pterodroma atrata 39,974[68] EN[68] Decrease[68] Estimate is based on 19,987 pairs.[68]
Campbell albatross Thalassarche impavida 43,296[69] VU[69] Increase[69]
MacGillivray's prion Pachyptila macgillivrayi 48,300-2,421,480[70] CR[70] Decrease[70] Best estimate for number of mature individuals is 350,000, based on an estimated 175,000 pairs. 95% confidence interval is very large.[70]
Antipodean albatrossDiomedea antipodensis50,000[71]EN[71]Decrease[71]Maximum estimate, given steep declines over past two decades.[71]
Buller's albatross Thalassarche bulleri 50,000-99,999[72] NT[72] Steady[72]
Light-mantled albatrossPhoebetria palpebrata58,000[73]NT[73]Decrease[73]Total population is estimated to be 87,000 individuals.[73]
Pink-footed shearwaterArdenna creatopus59,146[74]VU[74]?[74]Total population may be as high as 150,000 individuals.[74]
Swinhoe's storm petrelHydrobates monorhis65,000-260,000[75]NT[75]Steady[75]
Providence petrelPterodroma solandri66,500-100,000[76]LC[76]Steady[76]Best estimate for number of mature individuals is 83,000.[76]
Salvin's albatrossThalassarche salvini79,990[77]VU[77]?[77]Total population is estimated to be 110,000 individuals.[77]
Indian yellow-nosed albatrossThalassarche carteri82,000[78]EN[78]Decrease[78]Total population is estimated to be 160,000 individuals.[78]
Southern giant petrelMacronectes giganteus95,600-108,000[79]LC[79]Increase[79]Total population is estimated to be 150,000 individuals.[79]
White-necked petrelPterodroma cervicalis100,000[80]VU[80]Increase[80]Total population is estimated to be 150,000 individuals.[80]

Note that IOC taxonomy splits an additional species, the Vanuatu petrel, from this species.[1]

IUCN/BirdLife International maintain both species within P. cervicalis.[62]
Peruvian diving petrel Pelecanoides garnotii 100,000[81] NT[81] Increase[81]
Fluttering shearwaterPuffinus gavia>100,000[82]LC[82]Decrease[82]Value is for total population.[82]
Least storm petrel Hydrobates microsoma >100,000[83] LC[83] Steady[83] Total population is estimated "to number hundreds of thousands of individuals, possibly millions."[83]
Markham's storm petrelHydrobates markhami100,000-120,000[84]NT[84]Decrease[84]Total population is estimated to be 150,000-180,000 individuals.[84]
Fulmar prionPachyptila crassirostris100,000-200,000[85]LC[85]Steady[85]Total population is estimated to be 150,000-300,000 individuals.[85]
Little shearwaterPuffinus assimilis100,000-499,999[86]LC[86]Decrease[86]Total population is estimated to be 300,000-750,000 individuals.[86]

Note that IOC taxonomy splits an additional species, the Barolo shearwater, from this species.[1]

IUCN/BirdLife International maintain both species within P. assimilis.[62]
Black-footed albatrossPhoebastria nigripes139,800[87]NT[87]Increase[87]
Flesh-footed shearwaterArdenna carneipes148,000[88]NT[88]Decrease[88]
Band-rumped storm petrelHydrobates castro150,000[89]LC[89]Decrease[89]Value given is for total population.[89]
Herald petrelPterodroma heraldica150,000[90]LC[90]Decrease[90]Value given is for total population.[90]
Christmas shearwaterPuffinus nativitatis150,000[91]LC[91]Steady[91]Value given is for total population.[91]
Kermadec petrelPterodroma neglecta150,000-200,000[92]LC[92]Decrease[92]Values given are for total population.[92]
Grey petrelProcellaria cinerea151,500[93]NT[93]Decrease[93]
Black-vented shearwaterPuffinus opisthomelas200,000-299,999[94]NT[94]Steady[94]
Grey-backed storm petrelGarrodia nereis>200,000[95]LC[95]Decrease[95]Value given is for total population.[95]
Hutton's shearwaterPuffinus huttoni212,000[96]EN[96]Steady[96]Estimate based on 106,000 breeding pairs. Total population is estimated to be 300,000-350,000 individuals.[96]
Grey-headed albatrossThalassarche chrysostoma250,000[97]EN[97]Decrease[97]Minimum estimate for mature individuals.[97]
Stejneger's petrelPterodroma longirostris262,000[98]VU[98]Decrease[98]Total population is estimated to be 400,000 individuals. Population may now be lower due to increased predation pressure.[98]
Scopoli's shearwater Calonectris diomedea 285,000-446,000[99] LC[99] Decrease[99]
White-bellied storm petrelFregetta grallaria300,000[100]LC[100]Decrease[100]Value given is for total population.[100]
Grey-faced petrel Pterodroma gouldi 400,000-600,000[101] LC[101] Decrease[101] Total population is estimated to be 600,000-900,000 individuals.[101]
European storm petrelHydrobates pelagicus430,000-519,999[102]LC[102]?[102]Total population is estimated to be 1,314,000-1,545,000 individuals.[102]
Black-bellied storm petrelFregetta tropica500,000[103]LC[103]Decrease[103]Value given is for total population.[103]
Wedge-rumped storm petrelHydrobates tethys500,000[104]LC[104]Decrease[104]Value given is a minimum estimate for total population.[104]
Ringed storm petrel Hydrobates hornbyi 500,000-800,000[105] NT[105] Decrease[105] Total population is estimated to be 900,000-1,500,000 individuals.[105]
Bulwer's petrelBulweria bulwerii500,000-1,000,000[106]LC[106]Steady[106]Values given are for total population.[106]
Cory's shearwaterCalonectris borealis504,000-507,000[107]LC[107]?[107]
Black storm petrelHydrobates melania600,000[108]LC[108]Decrease[108]
White-headed petrelPterodroma lessonii600,000[109]LC[109]Decrease[109]Value given is for total population.[109]
Cook's petrelPterodroma cookii670,000[110]VU[110]Increase[110]
Manx shearwaterPuffinus puffinus680,000-790,000[111]LC[111]?[111]Total population is estimated to be 1,026,000-1,177,500 individuals.[111]
Murphy's petrel Pterodroma ultima 800,000-1,000,000[112] LC[112] ?[112] Values given are for total population.[112]
Bonin petrelPterodroma hypoleuca1,000,000[113]LC[113]Decrease[113]Value given is for total population.[113]
Kerguelen petrelAphrodroma brevirostris1,000,000[114]LC[114]Decrease[114]Value given is for total population.[114]
Black-browed albatrossThalassarche melanophrys1,400,000[115]LC[115]Increase[115]
Mottled petrel Pterodroma inexpectata >1,500,000[116] NT[116] Decrease[116] Value given is for total population.[116]
Great-winged petrelPterodroma macroptera>1,500,000[117]LC[117]Decrease[117]Value given is for total population.[117]
Laysan albatrossPhoebastria immutabilis1,600,000[118]NT[118]Steady[118]
Atlantic petrelPterodroma incerta1,800,000[119]EN[119]Decrease[119]
Juan Fernández petrelPterodroma externa2,000,000[120]VU[120]Steady[120]Total population was estimated to be, at minimum, 3.0 million individuals in 1986, but population appears to remain steady.[120]
Cape petrel

(Pintado petrel)

 Daption capense>2,000,000[121]LC[121]Steady[121]Value given is for total population.[121]
Buller's shearwaterArdenna bulleri2,500,000[122]VU[122]Steady[122]Value given is for total population. Estimate is dated; current population is likely lower.[122]
White-chinned petrelProcellaria aequinoctialis3,000,000[123]VU[123]Decrease[123]
Streaked shearwaterCalonectris leucomelas3,000,000[124]NT[124]Decrease[124]Value given is for total population.[124]
Blue petrelHalobaena caerulea>3,000,000[125]LC[125]Decrease[125]Value given is for total population.[125]
Southern fulmarFulmarus glacialoides4,000,000[126]LC[126]Steady[126]Value given is for total population.[126]
Fork-tailed storm petrelHydrobates furcatus4,000,000[127]LC[127]Increase[127]Total population is estimated to be 6.0 million individuals.[127]
White-faced storm petrelPelagodroma marina>4,000,000[128]LC[128]Decrease[128]Value given is for total population.[128]
Snow petrelPagodroma nivea>4,000,000[129]LC[129]Steady[129]Value given is for total population.[129]
Fairy prionPachyptila turtur5,000,000[130]LC[130]Steady[130]Value given is for total population.[130]
Soft-plumaged petrelPterodroma mollis>5,000,000[131]LC[131]Steady[131]Value given is for total population.[131]
Wedge-tailed shearwaterArdenna pacifica>5,200,000[132]LC[132]Decrease[132]Value given is for total population.[132]
Slender-billed prionPachyptila belcheri>7,000,000[133]LC[133]Steady[133]Value given is for total population.[133]
Black-winged petrelPterodroma nigripennis8,000,000-10,000,000[134]LC[134]Decrease[134]Values given are for total population.[134]
Wilson's storm petrelOceanites oceanicus8,000,000-20,000,000[135]LC[135]Steady[135]Total population is estimated to be 12.0-30.0 million individuals.[135]
Sooty shearwaterArdenna grisea8,800,000[136]NT[136]Decrease[136]Total population is estimated to be 19.0-23.6 million individuals.[136]
Great shearwaterArdenna gravis10,000,000[137]LC[137]Steady[137]Total population is estimated to number more than 15.0 million individuals.[137]
Antarctic petrelThalassoica antarctica10,000,000-20,000,000[138]LC[138]Steady[138]Values given are for total population.[138]
South Georgia diving petrelPelecanoides georgicus12,000,000[139]LC[139]Decrease[139]Total population is estimated to be 15.0 million individuals.[139]
Salvin's prionPachyptila salvini>12,000,000[140]LC[140]Steady[140]Value given is for total population.[140]
Leach's storm petrelHydrobates leucorhous13,400,000-16,600,000[141]VU[141]Decrease[141]Total population is estimated to be more than 20,000,000 individuals.[141]
Northern fulmarFulmarus glacialis14,000,000[142]LC[142]Increase[142]Total population is estimated to be 20,000,000 individuals.[142]
Broad-billed prionPachyptila vittata>15,000,000[143]LC[143]Decrease[143]Value given is for total population.[143]
Common diving petrelPelecanoides urinatrix>16,000,000[144]LC[144]Decrease[144]Value given is for total population.[144]
Short-tailed shearwaterArdenna tenuirostris>23,000,000[145]LC[145]Decrease[145]Value given is for total population.[145]
Antarctic prionPachyptila desolata50,000,000[146]LC[146]Decrease[146]Value given is for total population.[146]

Species without population estimates

Common name Binomial name Population Status Trend Notes Image
Bannerman's shearwater Puffinus bannermani unknown[147] EN[147] Decrease[147]
Tropical shearwater Puffinus bailloni unknown[148] LC[148] Steady[148] Some wide-ranging estimates indicate there are at least 28,100 total individuals, but many more breeding colonies remain unsurveyed.[148]
Subantarctic shearwater Puffinus elegans unknown[149] LC[149] Decrease[149] Population has not been formally estimated, though extrapolation from data in 2004 presented an estimate of "several hundred thousand pairs."[149]

See also

References

  1. 1 2 3 4 "Petrels, albatrosses – IOC World Bird List". www.worldbirdnames.org. Retrieved 2026-01-04.
  2. ↑ BirdLife International (2024). "Pterodroma rupinarum". IUCN Red List of Threatened Species. 2024 e.T22728800A262222743. doi:10.2305/IUCN.UK.2024-2.RLTS.T22728800A262222743.en.
  3. ↑ BirdLife International (2024). "Bulweria bifax". IUCN Red List of Threatened Species. 2024 e.T22728804A262268997. doi:10.2305/IUCN.UK.2024-2.RLTS.T22728804A262268997.en.
  4. 1 2 3 4 BirdLife International (2018). "Pseudobulweria macgillivrayi". IUCN Red List of Threatened Species. 2018 e.T22697935A132613365. doi:10.2305/IUCN.UK.2018-2.RLTS.T22697935A132613365.en.
  5. 1 2 3 4 BirdLife International (2018). "Hydrobates macrodactylus". IUCN Red List of Threatened Species. 2018. doi:10.2305/IUCN.UK.2018-2.RLTS.T22698530A132651919.en.
  6. 1 2 3 4 BirdLife International (2018). "Pterodroma caribbaea". IUCN Red List of Threatened Species. 2018 e.T22698097A132625182. doi:10.2305/IUCN.UK.2018-2.RLTS.T22698097A132625182.en.
  7. 1 2 3 4 BirdLife International (2018). "Fregetta maoriana". IUCN Red List of Threatened Species. 2018 e.T22728808A132659638. doi:10.2305/IUCN.UK.2018-2.RLTS.T22728808A132659638.en.
  8. 1 2 3 4 BirdLife International (2018). "Puffinus myrtae". IUCN Red List of Threatened Species. 2018 e.T132468585A132468877. doi:10.2305/IUCN.UK.2018-2.RLTS.T132468585A132468877.en.
  9. 1 2 3 4 BirdLife International (2018). "Puffinus bryani". IUCN Red List of Threatened Species. 2018 e.T45354718A132254426. doi:10.2305/IUCN.UK.2018-2.RLTS.T45354718A132254426.en.
  10. 1 2 3 4 BirdLife International (2018). "Pseudobulweria becki". IUCN Red List of Threatened Species. 2018 e.T22697913A132612218. doi:10.2305/IUCN.UK.2018-2.RLTS.T22697913A132612218.en.
  11. 1 2 3 4 BirdLife International (2018). "Pterodroma magentae". IUCN Red List of Threatened Species. 2018 e.T22698049A131879320.
  12. 1 2 3 4 BirdLife International. (2018). "Diomedea amsterdamensis". IUCN Red List of Threatened Species. 2018 e.T22698310A132397831. doi:10.2305/IUCN.UK.2018-2.RLTS.T22698310A132397831.en. Retrieved 26 August 2025.
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  14. 1 2 3 4 BirdLife International. (2018). "Pterodroma madeira". IUCN Red List of Threatened Species. 2018 e.T22698062A132622973. doi:10.2305/IUCN.UK.2018-2.RLTS.T22698062A132622973.en. Retrieved 26 August 2025.
  15. 1 2 3 4 BirdLife International (2018). "Pterodroma cahow". IUCN Red List of Threatened Species. 2018 e.T22698088A132624115. doi:10.2305/IUCN.UK.2018-2.RLTS.T22698088A132624115.en.
  16. 1 2 3 4 BirdLife International (2019). "Pelecanoides whenuahouensis". IUCN Red List of Threatened Species. 2019 e.T155187257A155188651. doi:10.2305/IUCN.UK.2019-3.RLTS.T155187257A155188651.en.
  17. 1 2 3 4 BirdLife International (2023). "Fregetta lineata". IUCN Red List of Threatened Species. 2023 e.T230025395A230864868. doi:10.2305/IUCN.UK.2023-1.RLTS.T230025395A230864868.en.
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  100. 1 2 3 4 BirdLife International (2018). "Fregetta grallaria". IUCN Red List of Threatened Species. 2018 e.T22698465A132649235. doi:10.2305/IUCN.UK.2018-2.RLTS.T22698465A132649235.en.
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  102. 1 2 3 4 BirdLife International (2018). "Hydrobates pelagicus". IUCN Red List of Threatened Species. 2018 e.T22698477A132650209. doi:10.2305/IUCN.UK.2018-2.RLTS.T22698477A132650209.en.
  103. 1 2 3 4 BirdLife International (2018). "Fregetta tropica". IUCN Red List of Threatened Species. 2018 e.T22698459A132648556. doi:10.2305/IUCN.UK.2018-2.RLTS.T22698459A132648556.en.
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