- "Batis"
- "Myiophobus"
- "Pycnopygius"
- "Pycnosphrys"
- 1758
- 2014
- 2016 splits and lumps
- 2314
- A Field Guide to the Birds of Devonshire
- Aachenosaurus multidens
- Aardonyx celestae
- Aardvark
- Aardwolf
- Abavornis bonaparti
- Abbott's
- Abbott's Babbler
- Abbott's Gannet
- Abbott's Starling
- Abd al-Kuri Sparrow
- Abdim's Stork
- Abdomen
- Abelisaurus comahuensis
- Aberdare Cisticola
- Aberrant
- Aberrant Bush-Warbler
- Abert's Squirrel
- Abert's Towhee
- Abmigration
- Abrasion
- Absolute magnitude
- Absorption
- Abyssal
- Abyssal plain
- Abyssal zone
- Abyssinian
- Abyssinian Catbird
- Abyssinian Crimsonwing
- Abyssinian Genet
- Abyssinian Ground-Thrush
- Abyssinian Ground Hornbill
- Abyssinian Lark
- Abyssinian Longclaw
- Abyssinian Nightjar
- Abyssinian Owl
- Abyssinian Roller
- Abyssinian Scimitarbill
- Abyssinian Slaty-Flycatcher
- Abyssinian Thrush
- Abyssinian Waxbill
- Abyssinian Wheatear
- Abyssinian White-eye
- Abyssinian Woodpecker
- Acacia Pied-Barbet
- Acacia Tit
- Acadian Flycatcher
- Accentor
- Accidental
- Accipiter
- Accipiter (tribe)
- Accipitridae
- Accipitriformes
- Accipitrimorphae
- Accipitrine hawk
- Acetabulum
- Acid (soil)
- Acinonyx
- Acinonyx kurteni
- Acinonyx pardinensis
- Acorn Woodpecker
- Acquisition
- Acre Antshrike
- Acre Tody-Tyrant
- Acrobatidae
- Acrocephalidae
- Acrocephalus
- Actenoides
- Actitis
- Active galaxy
- Actophilornis
- Adamawa Turtle-Dove
- Adaptive radiation
- Addition
- Adelaide's Warbler
- Adelaide Rosella
- Adelie Penguin
- Adenosine triphosphate
- Adjutant
- Admirable Bolete
- Admirable Hummingbird
- Adrenal cortex
- Adult
- Adult plumage
- Adzebill
- Aechmophorus
- Aedonopsis
- Aegialornis
- Aegithalos
- Aepyornis
- Aepypodius
- Aequorlitornithes
- Aequornithes
- Aerie
- Aerodramus
- Aeronautes
- Aerospiza
- Aethia
- Aethopyga
- Afep Pigeon
- Afghan Babbler
- Afghan Snowfinch
- Afghan Sparrow
- Africa
- African Angelshark
- African Barred Owlet
- African Black-Swift
- African Black Duck
- African Blue Flycatcher
- African Broadbill
- African Citril
- African Collared-Dove
- African Crake
- African Crimson-winged Finch
- African Cuckoo
- 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 Golden Cat
- African Golden Oriole
- African Goshawk
- African Grass-Owl
- African Grass Hummingbird
- African Green-Pigeon
- African Grey-Woodpecker
- African Grey Flycatcher
- African Grey Hornbill
- African Harrier-Hawk
- African Hawk-Eagle
- African Hill-Babbler
- African Hobby
- African Hoopoe
- African Jacana
- African Leopard
- African Long-eared Owl
- African Marsh-Harrier
- African Olive-Pigeon
- African Openbill
- African Oystercatcher
- African Palm-Swift
- African Palm Civet
- African Paradise-Flycatcher
- African Penguin
- African Piculet
- African Pied Hornbill
- African Pied Wagtail
- African Pipit
- African Pitta
- African Pygmy-Goose
- African Pygmy Kingfisher
- African Quailfinch
- African Rail
- African Red-eyed Bulbul
- African Reed-Warbler
- African Ribbontail Catshark
- African River Martin
- African Rock Pipit
- African Sacred Ibis
- African Sawtail Catshark
- 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 Wild Ass
- African Wood-Owl
- African Yellow-Warbler
- African barbet
- African broadbill
- African giant eagle-owl
- African owlet
- African spurfowl
- African starling
- African terrestrial barbet
- African thrush-babbler
- African trogon
- African vulture
- African warbler
- Afro-Eurasian starling
- Afro-Neotropical parrot
- Afroaves
- Afrosoricida
- Afrotropical parrot
- Agami Heron
- Agapornithine parrot
- Agaricales
- Agelaius
- Agelastes
- Agelasticus
- Agile Antechinus
- Agile Kangaroo Rat
- Agile Sparrowhawk
- Agile Tit-Tyrant
- Agnatha
- Agricola
- Agropsar
- Aguiguan Reed-Warbler
- Agulhas Long-billed Lark
- Ahanta Francolin
- Ahlgren's Avocet
- Ailuroedus
- Aimophila
- Ainley's Storm-Petrel
- Air mass
- Air sac
- Airfoil
- Aix
- Akalat
- Akekee
- Akepa
- Akialoa
- Akiapolaau
- Akikiki
- Akletos
- Akohekohe
- Akun Eagle-Owl
- Alagoas Antwren
- Alagoas Curassow
- Alagoas Foliage-gleaner
- Alagoas Tyrannulet
- Alaotra Grebe
- Alarm call
- Alaska
- Alaska Marmot
- Alauahio
- Alauda
- Albatross
- Albedo
- Albert's Lyrebird
- Albertine Owlet
- Albino
- Alcedo
- Aldabra Brush-Warbler
- Aldabra Drongo
- Aldabra Fody
- Alder Flycatcher
- Alectoris
- Alectrurus
- Alethe
- Aleutian Tern
- Alexander Wetmore
- Alexandra's Parrot
- Alexandrine Parakeet
- Alexornis antecedens
- Algae
- Algerian Nuthatch
- Alkaline (soil)
- All Birds:Community Portal
- All Birds:Projects
- All Birds:Random facts
- All Birds: Featured bird archives
- All Birds Universe
- All Birds Wiki
- All Birds Wiki/Page 2
- All Birds Wiki/Sandbox
- Allen's Big-eared Bat
- Allen's Chipmunk
- Allen's Gallinule
- Allen's Hummingbird
- Allopatric
- Allopreening
- Allpahuayo Antbird
- Alopecoenas
- Alophoixus
- Alopochen
- Alpine Accentor
- Alpine Chipmunk
- Alpine Chough
- Alpine Leaf Warbler
- Alpine Pipit
- Alpine Swift
- Alpine Thrush
- Alstrom's Warbler
- Alta Floresta Antpitta
- Altai Accentor
- Altai Falcon
- Altai Snowcock
- Altamira Oriole
- Altamira Yellowthroat
- Altricial
- Alula
- Alvarezsaur
- Alveolate
- Amadina
- Amakihi
- Amami Thrush
- Amami Woodcock
- Amandava
- Amani Sunbird
- Amanita
- Amatoxin
- Amaui
- Amaurornis
- Amaurospiza
- Amazilia
- Amazilia Hummingbird
- Amazon Basin
- Amazon Kingfisher
- Amazon Rainforest
- Amazon Weasel
- Amazon parrot
- Amazonian Antpitta
- Amazonian Antshrike
- Amazonian Barred-Woodcreeper
- Amazonian Black-Tyrant
- Amazonian Crow
- Amazonian Flamingo
- Amazonian Leaftosser
- Amazonian Motmot
- Amazonian Mouse-coloured Tyrannulet
- Amazonian Parrotlet
- Amazonian Pygmy-Owl
- Amazonian Rhea
- Amazonian Royal Flycatcher
- Amazonian Scrub-Flycatcher
- Amazonian Streaked-Antwren
- Amazonian Swift
- Amazonian Trogon
- Amazonian Tyrannulet
- Amazonian Umbrellabird
- Amazonian Yellow-crowned Amazon
- Amazonian Yellow-rumped Cacique
- Amber motmot
- Ambiortiformes
- Amblyornis
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