- Abbott's Babbler
- Abdim's Stork
- Aberdare Cisticola
- Aberrant Bush Warbler
- Abyssinian Catbird
- Abyssinian Ground Hornbill
- Abyssinian Roller
- Abyssinian Scimitarbill
- Abyssinian Slaty Flycatcher
- Abyssinian Thrush
- Abyssinian Wheatear
- Abyssinian White-eye
- Acacia Pied Barbet
- Acacia Tit
- Acadian Flycatcher
- Acorn Woodpecker
- Adelie Penguin
- Afep Pigeon
- African Barred Owlet
- African Black Duck
- African Black Swift
- African Blue Flycatcher
- African Blue Tit
- African Broadbill
- African Chaffinch
- African Citril
- African Collared Dove
- African Crake
- African Cuckoo
- African Cuckoo-Hawk
- African Darter
- African Dusky Flycatcher
- African Emerald Cuckoo
- African Finfoot
- African Firefinch
- African Fish Eagle
- African Golden Oriole
- African Goshawk
- African Green Bee-eater
- African Green Pigeon
- African Grey Flycatcher
- African Grey Hornbill
- African Grey Woodpecker
- African Harrier-Hawk
- African Hawk-Eagle
- African Hobby
- African Hoopoe
- African Jacana
- African Marsh Harrier
- African Olive Pigeon
- African Openbill
- African Oystercatcher
- African Palm Swift
- African Paradise Flycatcher
- African Penguin
- African Pied Wagtail
- African Pipit
- African Pitta
- African Pygmy Goose
- African Pygmy Kingfisher
- African Rail
- African Red-eyed Bulbul
- African Rock Pipit
- African Sacred Ibis
- African Scops Owl
- African Shrike-flycatcher
- African Silverbill
- African Skimmer
- African Snipe
- African Spoonbill
- African Spotted Creeper
- African Stonechat
- African Swamphen
- African Thrush
- African Wattled Lapwing
- African Wood Owl
- African Woolly-necked Stork
- African Yellow Warbler
- Agami Heron
- Agulhas Long-billed Lark
- Albert's Lyrebird
- Alder Flycatcher
- Alexandrine Parakeet
- Allen's Gallinule
- Alpine Accentor
- Alpine Chough
- Alpine Pipit
- Alpine Swift
- Alpine Thrush
- Alström's Warbler
- Altai Snowcock
- Altamira Oriole
- Amani Sunbird
- Amazilia Hummingbird
- Amazon Kingfisher
- Amazonian Barred Woodcreeper
- Amazonian Black-throated Trogon
- Amazonian Motmot
- Amazonian Trogon
- Amazonian Umbrellabird
- Ameline Swiftlet
- American Avocet
- American Barn Owl
- American Bushtit
- American Cliff Swallow
- American Coot
- American Crow
- American Dipper
- American Dusky Flycatcher
- American Flamingo
- American Goldfinch
- American Kestrel
- American Oystercatcher
- American Pygmy Kingfisher
- American Redstart
- American Robin
- American White Ibis
- American White Pelican
- American Wigeon
- American Yellow Warbler
- Amethyst-throated Mountaingem
- Amethyst-throated Sunangel
- Amethyst Brown Dove
- Amethyst Sunbird
- Amethyst Woodstar
- Amur Falcon
- Amur Paradise Flycatcher
- Ancash Tapaculo
- Anchieta's Barbet
- Anchieta's Sunbird
- Andaman Boobook
- Andaman Bulbul
- Andaman Coucal
- Andaman Crake
- Andaman Cuckoo-Dove
- Andaman Cuckooshrike
- Andaman Drongo
- Andaman Flowerpecker
- Andaman Green Pigeon
- Andaman Masked Owl
- Andaman Nightjar
- Andaman Scops Owl
- Andaman Serpent Eagle
- Andaman Shama
- Andaman Teal
- Andaman Treepie
- Andaman Wood Pigeon
- Andaman Woodpecker
- Andean Avocet
- Andean Cock-of-the-rock
- Andean Condor
- Andean Coot
- Andean Duck
- Andean Emerald
- Andean Flamingo
- Andean Flicker
- Andean Goose
- Andean Guan
- Andean Gull
- Andean Ibis
- Andean Lapwing
- Andean Motmot
- Andean Negrito
- Andean Potoo
- Andean Pygmy Owl
- Andean Teal
- Andean Tinamou
- Andean Tit-Spinetail
- Angola Batis
- Angola Cave Chat
- Angola Lark
- Angola Slaty Flycatcher
- Angola Swallow
- Angola Waxbill
- Anhinga
- Anjouan Brush Warbler
- Anjouan Scops Owl
- Anjouan Sunbird
- Ansorge's Greenbul
- Ant-eating Chat
- Antarctic Prion
- Antarctic Shag
- Antarctic Tern
- Anteater Chat
- Antillean Palm Swift
- Antipodean Albatross
- Aplomado Falcon
- Apo Myna
- Apostlebird
- Appert's Tetraka
- Apricot-breasted Sunbird
- Arabian Bustard
- Archbold's Newtonia
- Arctic Redpoll
- Arctic Tern
- Arctic Warbler
- Arfak Honeyeater
- Arnot's Chat
- Arrow-marked Babbler
- Arrowhead Piculet
- Arrowhead Warbler
- Ash-breasted Sierra Finch
- Ash-browed Spinetail
- Ash-throated Crake
- Ash-throated Flycatcher
- Ashy-bellied White-eye
- Ashy-crowned Sparrow-Lark
- Ashy-headed Greenlet
- Ashy-headed Laughingthrush
- Ashy-throated Parrotbill
- Ashy-throated Warbler
- Ashy Bulbul
- Ashy Cisticola
- Ashy Drongo
- Ashy Flycatcher
- Ashy Minivet
- Ashy Prinia
- Ashy Robin
- Ashy Starling
- Ashy Tailorbird
- Ashy Thrush
- Ashy Tit
- Ashy Woodpecker
- Ashy Woodswallow
- Asian Barred Owlet
- Asian Brown Flycatcher
- Asian Desert Warbler
- Asian Dowitcher
- Asian Fairy-bluebird
- Asian Glossy Starling
- Asian Golden Weaver
- Asian Green Bee-eater
- Asian House Martin
- Asian Koel
- Asian Openbill
- Asian Palm Swift
- Asian Red-eyed Bulbul
- Asian Short-toed Lark
- Asian Woolly-necked Stork
- Athi Short-toed Lark
- Atlantic Canary
- Atlantic Puffin
- Audubon's Oriole
- Audubon's Warbler
- Augur Buzzard
- Austral Negrito
- Austral Thrush
- Australasian Bittern
- Australasian Darter
- Australasian Figbird
- Australasian Gannet
- Australasian Grebe
- Australasian Shoveler
- Australasian Swamphen
- Australian Boobook
- Australian Brushturkey
- Australian Bustard
- Australian Crake
- Australian Golden Whistler
- Australian Hobby
- Australian King Parrot
- Australian Logrunner
- Australian Magpie
- Australian Owlet-nightjar
- Australian Pelican
- Australian Pied Cormorant
- Australian Pipit
- Australian Pratincole
- Australian Raven
- Australian Reed Warbler
- Australian Ringneck
- Australian Rufous Fantail
- Australian Shelduck
- Australian Swiftlet
- Australian Tern
- Australian White Ibis
- Australian Zebra Finch
- Ayres's Hawk-Eagle
- Azara's Spinetail
- Azure-breasted Pitta
- Azure-hooded Jay
- Azure-shouldered Tanager
- Azure-winged Magpie
- Azure Dollarbird
- Azure Kingfisher
- Azure Tit