- AEECL's sportive lemur
- A local squidward
- Aardvark
- Abednedo
- Abelisaurus
- Aboleth
- Aboogala
- Absol
- Abyssal Zharkulan
- Abyssin
- Acacia Ant
- Achatinella apexfulva
- Ache
- Achernonian
- Achillobator
- Acid Lizard
- Acklay
- Acrocanthosaurus
- Actaea pachypoda
- Adder Moss
- Adocus beatus
- Aecyto Weevil
- Aegyptopithecus
- Aerodactyl
- Aeronite
- Afanc (Dungeons & Dragons)
- African Golden Cat
- African Inostrancevia
- African Orangutan
- African Wild Ass
- African bush elephant
- African forest elephant
- African wild dog
- Africanatapithecus Troglodyte
- Agaocephala margaridae
- Agropelter
- Ahool
- Air Cheep
- Akantor
- Aku's species
- Alagoas Foliage-gleaner
- Alaskan Tundra Inostrancevia
- Alaskan Tundra Scutosaurus
- Alaskan therizinosaur
- Albacore
- Albino Penguin (Cthulhu Mythos)
- Aldebaran Serpent
- Alert Spider
- Alexander Archipelago Inostrancevia
- Alfirin
- Alien
- Alien Grunt
- Alien Hominid
- All Animals Gallery
- All Species Wiki
- All Species Wiki/Guidelines
- Alolan Raichu
- Alolan Raticate
- Alomomola
- Alphadon
- Alpine ibex
- Altaspinaretrus russienses
- Aluur
- Amargospinus
- Amebelodon
- Amebzian
- American Lion
- American True Lion
- American black bear
- American burnweed
- American woolly Theriziosaur
- Amorph Gallery
- Amorphophallus titanum
- Amphibian Gallery
- Amphibian Gallery (By Type)
- Amphibiosan
- Amur honeysuckle
- Ancestor Moth
- Ancient Katydid
- Ancient Wyvern (Enroth)
- Anemone Frenzy
- Angel
- Angel (Mythology)
- Angel Kernel
- Anguirus
- Animal
- Animal-Headed Humans
- Animated Inanimate Objects
- Animatronic
- Anime cat human
- Anime human
- Ankheg (Warcraft)
- Anomalocaris
- Anomaly Species
- Anoplolepis gracillipes
- Ant (Elder Scrolls)
- Ant Lion (Dungeons & Dragons)
- Antarctic Krill
- Antarctican Fruit Owl
- Anti raptor insect
- Antler Grass
- Antlion (American McGee's Alice)
- Ape (Final Fantasy Adventure)
- Apeis stupidius
- Apis andrenimelli
- Aplysina fistularis
- Apo red
- Apple
- Appule's Race
- Aquafly
- Aquaprimatus
- Aquatican
- Arabic: Julto
- Aracha
- Arachnid Gallery
- Arbok
- Arceus
- Archaeoindris
- Archaeotherium
- Archaeovenator hamiltonensis
- Arctic Boar
- Arctic Coyote
- Arctic Crocodile
- Arctic Elk
- Arctic Hare
- Arctic Lion
- Arctic Mammoth
- Arctic Moose
- Arctic Santabearded Evil Lorax
- Arctic Spinosaurus
- Arctic Tyrannosaurus
- Argonian
- Arie (sea lion)
- Arkadai
- Army
- Army Ant (American McGee's Alice)
- Army Ant (Hasbro)
- Arrowtail Deeno
- Artichoker (Super Mario Bros)
- Articuno
- Artott
- Aruroda
- Ash Hopper
- Ash black slug
- Asian Elephant
- Asian giant hornet
- Asian marauder ant
- Assault Spider
- Asthma Hound Chihuahua
- Astro Toilet
- Astrocetus
- Astrodon
- Asura-class
- Asëa Aranion
- Atlantic Sea King
- Atlantic goliath grouper
- Atlas beetle
- Atmorans
- Atomic Sludge
- Auctioneer
- Australian Inostrancevia
- Australian eiger (with brown coat, white stripes and cat ears)
- Australian sea lion
- Austroraptor
- Avari
- Avian (Breath of Fire)
- Avin
- Awoofy
- Axolotl
- Axolotl (Final Fantasy IX)
- Aye-aye
- BB
- B (species)
- Baalgar
- Baby Blizzard Bear
- Baby Cheveux
- Baby Pine Cat
- Baby Sharks Species
- Baby evoker (Alien Being)
- Bacillus sapiens
- Bacterial lifeform (CharlsonIV)
- Baeus
- Baffin Island Scutosaurus
- Bagnadrana
- Baird's Tapir
- Bald Eagle
- Baldi's species
- Bali Myna
- Balrog
- Banana Bird
- Bananaman
- Banapple
- Bar-Lgura
- Barako The Sun Chief
- Barbary Lion
- Bargibant's Seahorse
- Barn orbweaver
- Barnabys species
- Bas
- Basement Man (Life Of Luxury)
- Basking Shark
- Bassasaurus rex
- Bastiodon
- Bat (spear of destiny)
- Batsquatch
- Battletoad
- Baweng Satanic Leaf Gecko
- Bazuka
- Bazza
- Beachplug
- Bean (Spore Animal)
- Bear
- Bear-eared Ursihominid
- Bear-nose-Ursihominid
- Bear owl (Croods)
- Bearger
- Bedbug (flushed away)
- Beerus
- Beetle Gallery
- Beetull
- Behemhoot
- Behemoth (MonsterVerse)
- Behemoth (Trevor Henderson)
- Bellossom
- Beluga
- Bender
- Bernard's Inostrancevia
- Bewarewolf (Dragon Quest)
- Bewear
- Bewilderbeast
- Bibarel
- Bichir
- Big Caesar
- Big Charlie
- Big Chungus
- Big piranha plant
- Bigfoot
- Bigfoot (2012 Film)
- Bigger Chungus
- Bigleaf mahogany
- BikiniBottomian
- Bilkan
- Biln
- Bio-Android
- Bird Gallery
- Bison
- Bit (Adventure of Link)
- Bitesize
- Black & White Tiger
- Black Apple (Super Mario Bros)
- Black Beauty Stick Insect
- Black Gigantopitcheus
- Black Martian
- Black Pinecone Bee
- Black Stink Bug
- Black Terror Ant
- Black cherry
- Black hairy scorpion
- Black locust
- Black whipsnake
- Blade Scorpion
- Blastercyst
- Bleached Rattlesnake
- Bliblie
- Blink (Diablo)
- Blinky
- Blipper
- Bloathead Minecraft Zombie
- Blob (The Blob 1988)
- Blobfish
- Blood Barnacle
- Blood Bat (Breath of Fire III)
- Blood Siren Head
- Blood Thrasher
- Bloody Wasp
- Bloom (Super Mario Bros)
- Blooper
- Blue's species
- Blue Angel
- Blue Bear
- Blue Chocobo
- Blue Crayfish
- Blue Dartwing
- Blue Fuggler (Sir Horns a Lot)
- Blue Whale
- Blue death feigning beetle
- Blue milkweed beetle
- Blue spruce
- Bluehair Santabearded Evil Lorax
- Blurp
- Boa constrictor
- Boball
- Bog-Rat
- Bog Octopus
- Bog Perch (Torchlight)
- Bogdanoff Twins
- Bogeyman (InCryptid)
- Boko Baba
- Bokoblin
- Bolterfly
- Bone Hawk
- Bonnethead Shark
- Boogey man
- Boombo Bird
- Booty Bird
- Boov
- Bosh
- Bosoptera
- Boss Monster
- Bot (Adventure of Link)
- Bottlenose dolphin
- Boulenger’s Speckled Skink
- Bounty Bass
- Bowser
- Brayniac
- Brazilian Gracile Opossum
- Breaking News (Trevor Henderson)
- Brenchian
- Breton
- Bristleback
- Bristles
- British Columbia Inostrancevia
- Bronto Burt
- Brown Obscursin Ape
- Brown rat
- Bruxish
- Bryder
- Bub (Cheep Cheep species)
- Bubbles
- Budgerigar
- Bulbfly
- Bulbous
- Bulette
- Bullywug
- Bunyip
- Buoygea
- Burmecian
- Burp Hopper
- Burrow Octorok
- Burrower (Metroid)
- Butch (Grizzly Park)
- Buzz
- Buzz Bomber
- Cactus Cat
- Caiman
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