This is a list of Ciconiiformes 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.

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This list is incomprehensive, as not all Ciconiiformes have had their numbers quantified. The classification of this order of birds is currently in flux; the classification for this list is aligned with the IUCN's current position, but may change in the future.

Furthermore, some species currently listed below are no longer considered Ciconiformes; they have been reclassified under Pelecaniformes (e.g. the Black-crowned night heron, listed below). Click the species page for a more definitive classification.

Species by global population

Common name	Binomial name	Population	Status	Trend	Notes	Image
São Tomé ibis	Bostrychia bocagei	70 – 400[1]	CR[1]	[1]
White-bellied heron	Ardea insignis	70 – 400[2]	CR[2]	[2]
Giant ibis	Thaumatibis gigantea	345[3]	CR[3]	[3]	Minimum estimate.[3]
White-eared night heron	Gorsachius magnificus	350 – 1500[4]	EN[4]	[4]
Storm's stork	Ciconia stormi	400 – 500[5]	EN[5]	[5]
Crested ibis	Nipponia nippon	500[6]	EN[6]	[6]
White-shouldered ibis	Pseudibis davisoni	970[7]	CR[7]	[7]	Minimum estimate.[7]
Japanese night heron	Gorsachius goisagi	1000 – 2499[8]	EN[8]	[8]
Fasciated tiger heron	Tigrisoma fasciatum	1000 – 10 000[9]	LC[9]	Unknown[9]
Greater adjutant	Leptoptilos dubius	1200 – 1800[10]	EN[10]	[10]
Humblot's heron	Ardea humbloti	1500[11]	EN[11]	[11]	Maximum estimate.[11]
Australasian bittern	Botaurus poiciloptilus	1500 – 4000[12]	EN[12]	[12]
Malagasy pond heron	Ardeola idae	2000 – 6000[13]	EN[13]	[13]
Malayan night heron	Gorsachius melanolophus	2000 – 20 000[14]	LC[14]	Unknown[14]
Malagasy sacred ibis	Threskiornis bernieri	2300 – 3250[15]	EN[15]	[15]
Forest bittern	Zonerodius heliosylus	2500 – 9999[16]	NT[16]	[16]
Black-faced spoonbill	Platalea minor	2693[17]	EN[17]	[17]
Oriental stork	Ciconia boyciana	3000[18]	EN[18]	[18]
Slaty egret	Egretta vinaceigula	3000 – 5000[19]	VU[19]	[19]
Chinese egret	Egretta eulophotes	3600 – 6400[20]	VU[20]	[20]
Milky stork	Mycteria cinerea	5000[21]	VU[21]	[21]	Maximum estimate.[21]
Lesser adjutant	Leptoptilos javanicus	6500 – 8000[22]	VU[22]	[22]	Numbers could be underestimated.[22]
Southern bald ibis	Geronticus calvus	8000 – 10 000[23]	VU[23]	[23]
Madagascar ibis	Lophotibis cristata	10 000[24]	NT[24]	[24]
Puna ibis	Plegadis ridgwayi	10 000 – 15 000[25]	LC[25]	[25]
Jabiru	Jabiru mycteria	10 000 – 25 000[26]	LC[26]	Unknown[26]
Sharp-tailed ibis	Cercibis oxycerca	10 000 – 25 000[27]	LC[27]	[27]
Painted stork	Mycteria leucocephala	15 000 – 25 000[28]	NT[28]	[28]
Black-headed ibis	Threskiornis melanocephalus	15 000 – 30 000[29]	NT[29]	[29]
Reddish egret	Egretta rufescens	15 000 – 30 000[30]	NT[30]	[30]
Black-necked stork	Ephippiorhynchus asiaticus	15 000 – 35 000[31]	NT[31]	[31]
Black stork	Ciconia nigra	24 000 – 44 000[32]	LC[32]	Unknown[32]
Black-faced ibis	Theristicus melanopis	25 000 – 100 000[33]	LC[33]	[33]
Agami heron	Agamia agami	50 000 – 499 999[34]	VU[34]	Unknown[34]
Bare-throated tiger heron	Tigrisoma mexicanum	50 000 – 499 999[35]	LC[35]	Unknown[35]
Pinnated bittern	Botaurus pinnatus	50 000 – 499 999[36]	LC[36]	Unknown[36]
Black bittern	Ixobrychus flavicollis	63 000 – 320 000[37]	LC[37]	[37]
Eurasian spoonbill	Platalea leucorodia	66 000 – 140 000[38]	LC[38]	Unknown[38]
Pacific reef heron	Egretta sacra	100 000 – 1 000 000[39]	LC[39]	[39]
Yellow bittern	Ixobrychus sinensis	100 000 – 1 000 000[40]	LC[40]	Unknown[40]
Eurasian bittern	Botaurus stellaris	110 000 – 340 000[41]	LC[41]	[41]
Striated heron	Butorides striata	150 000 – 1 200 000[42]	LC[42]	[42]
Intermediate egret	Mesophoyx intermedia	180 000 – 1 300 000[43]	LC[43]	[43]
Spot-breasted ibis	Bostrychia rara	200 000 – 510 000[44]	LC[44]	[44]
Purple heron	Ardea purpurea	270 000 – 570 000[45]	LC[45]	[45]
Grey heron	Ardea cinerea	290 000 – 3 700 000[46]	LC[46]	Unknown[46]
Boat-billed heron	Cochlearius cochlearius	500 000 – 4 999 999[47]	LC[47]	Unknown[47]
Black-crowned night heron	Nycticorax nycticorax	510 000 – 3 600 000[48]	LC[48]	[48]
Little egret	Egretta garzetta	640 000 – 3 100 000[49]	LC[49]	[49]
Straw-necked ibis	Threskiornis spinicollis	1 000 000[50]	NT[50]	[50]
White-faced ibis	Plegadis chihi	1 200 000[51]	LC[51]	[51]
Cattle egret	Bubulcus ibis	3 800 000 – 7 600 000[52]	LC[52]	[52]

See also

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

References