- Abbott's Babbler
- Abdim's Stork
- Aberrant Bush Warbler
- Abert's Towhee
- Abyssinian Catbird
- Abyssinian Ground Hornbill
- Abyssinian Ground Thrush
- Abyssinian Longclaw
- Abyssinian Roller
- Abyssinian Scimitarbill
- Abyssinian Slaty Flycatcher
- Abyssinian Thrush
- Abyssinian Wheatear
- Abyssinian White-eye
- Abyssinian Woodpecker
- Acacia Pied Barbet
- Acacia Tit
- Acadian Flycatcher
- Acorn Woodpecker
- Adamawa Turtle Dove
- African Black Duck
- African Black Swift
- African Blue Flycatcher
- African Blue Tit
- African Broadbill
- African Citril
- African Collared Dove
- African Cuckoo-Hawk
- African Darter
- African Desert Warbler
- African Dusky Flycatcher
- African Dwarf Kingfisher
- African Emerald Cuckoo
- African Finfoot
- African Firefinch
- African Fish Eagle
- African Goshawk
- African Green Pigeon
- African Grey Flycatcher
- African Grey Hornbill
- African Harrier-Hawk
- African Hawk-Eagle
- African Hill Babbler
- African Hobby
- African Jacana
- African Marsh Harrier
- African Olive Pigeon
- African Openbill
- African Oystercatcher
- African Palm Swift
- African Paradise Flycatcher
- African Penguin
- African Piculet
- African Pied Wagtail
- African Pipit
- African Pygmy Goose
- African Pygmy Kingfisher
- African Red-eyed Bulbul
- African Sacred Ibis
- African Scops Owl
- African Silverbill
- African Snipe
- African Spoonbill
- African Spotted Creeper
- African Stonechat
- African Swamphen
- African Thrush
- African Wattled Lapwing
- African Wood Owl
- African Yellow Warbler
- Agami Heron
- Akun Eagle-Owl
- Alagoas Antwren
- Alagoas Foliage-gleaner
- Alagoas Tyrannulet
- Alder Flycatcher
- Aleutian Tern
- Allen's Gallinule
- Allen's Hummingbird
- Alpine Accentor
- Alpine Chough
- Alpine Pipit
- Alpine Swift
- Alström's Warbler
- Altai Accentor
- Amami Woodcock
- Amazilia Hummingbird
- Amazon Kingfisher
- Amazonian Antshrike
- Amazonian Barred Woodcreeper
- Amazonian Black-throated Trogon
- Amazonian Black Tyrant
- Amazonian Streaked Antwren
- Amazonian Umbrellabird
- Amboyna Cuckoo-Dove
- American Avocet
- American Barn Owl
- American Bittern
- American Bushtit
- American Cliff Swallow
- American Coot
- American Crow
- American Crow (caurinus)
- American Dipper
- American Golden Plover
- American Grey Flycatcher
- American Herring Gull
- American Kestrel
- American Oystercatcher
- American Redstart
- American Robin
- American Tree Sparrow
- American White Ibis
- American White Pelican
- American Wigeon
- American Yellow Warbler
- Amethyst-throated Sunangel
- Amethyst Sunbird
- Amethyst Woodstar
- Amur Falcon
- Amur Stonechat
- Anchieta's Barbet
- Anchieta's Sunbird
- Andaman Coucal
- Andaman Cuckoo-Dove
- Andaman Green Pigeon
- Andaman Scops Owl
- Andean Cock-of-the-rock
- Andean Condor
- Andean Duck
- Andean Emerald
- Andean Flicker
- Andean Goose
- Andean Guan
- Andean Gull
- Andean Hillstar
- Andean Lapwing
- Andean Motmot
- Andean Potoo
- Andean Siskin
- Andean Solitaire
- Andean Swift
- Andean Teal
- Andean Tit-Spinetail
- Angola Batis
- Angola Cave Chat
- Angola Lark
- Angola Slaty Flycatcher
- Angola Swallow
- Angola Waxbill
- Anhinga
- Ankober Serin
- Anna's Hummingbird
- Ansorge's Greenbul
- Anteater Chat
- Antipodean Albatross
- Apical Flycatcher
- Apolinar's Wren
- Apricot-breasted Sunbird
- Aquatic Warbler
- Arabian Bustard
- Arafura Fantail
- Arafura Shrikethrush
- Araripe Manakin
- Archer's Lark
- Arctic Tern
- Arctic Warbler
- Arfak Honeyeater
- Arizona Woodpecker
- Armenian Gull
- Arrow-marked Babbler
- Ash-browed Spinetail
- Ash-colored Tapaculo
- Ash-throated Casiornis
- Ash-throated Flycatcher
- Ash-throated Gnateater
- Ashy-bellied White-eye
- Ashy-crowned Sparrow-Lark
- Ashy-headed Goose
- Ashy-headed Tyrannulet
- Ashy-throated Chlorospingus
- Ashy Bulbul
- Ashy Drongo
- Ashy Minivet
- Ashy Prinia
- Ashy Robin
- Ashy Tit
- Ashy Wood Pigeon
- Asian Barred Owlet
- Asian Brown Flycatcher
- Asian Desert Warbler
- Asian Dowitcher
- Asian Fairy-bluebird
- Asian Green Bee-eater
- Asian House Martin
- Asian Koel
- Asian Openbill
- Asian Palm Swift
- Asian Stubtail
- Asian Woolly-necked Stork
- Atlantic Canary
- Atlantic Puffin
- Atoll Starling
- Audouin's Gull
- Audubon's Warbler
- Augur Buzzard
- Austral Thrush
- Australasian Bittern
- Australasian Gannet
- Australasian Shoveler
- Australasian Swamphen
- Australian Hobby
- Australian King Parrot
- Australian Magpie
- Australian Owlet-nightjar
- Australian Pied Cormorant
- Australian Pratincole
- Australian Reed Warbler
- Australian Ringneck
- Australian Rufous Fantail
- Australian Shelduck
- Australian White Ibis
- Ayres's Hawk-Eagle
- Azara's Spinetail
- Azores Bullfinch
- Azure-crested Flycatcher
- Azure-winged Magpie
- Azure Kingfisher
- Azure Tit