- Caecilian
- Caiman
- Caiman lizard
- Calf
- Camel
- Canary
- Canine
- Canvasback
- Cape ghost frog
- Capybara
- Caracal
- Cardinal
- Caribou
- Carp
- Cassowary
- Cat
- Catbird
- Caterpillar
- Catfish
- Cattle
- Caudata
- Cavy
- Centipede
- Chafer
- Chameleon
- Chamois
- Cheetah
- Chevrotain
- Chick
- Chickadee
- Chicken
- Chihuahua
- Chimney swift
- Chimpanzee
- Chinchilla
- Chinese crocodile lizard
- Chipmunk
- Chital
- Chrysomelid
- Chuckwalla
- Chupacabra
- Cicada
- Cirriped
- Civet
- Clam
- Cleaner wrasse
- Clown anemone fish
- Clumber
- Coati
- Cob
- Cobra
- Cockatiel
- Cockatoo
- Cocker spaniel
- Cockroach
- Cod
- Coelacanth
- Collard lizard
- Colt
- Comet
- Conch
- Condor
- Coney
- Conure
- Coot
- Cooter
- Copepod
- Copperhead
- Coqui
- Coral
- Cormorant
- Corn snake
- Corydoras Catfish
- Cottonmouth
- Cottontail
- Cougar
- Cow
- Cowbird
- Cowrie
- Coyote
- Coypu
- Crab
- Crane
- Crayfish
- Cricket
- Crocodile
- Crocodile skink
- Crossbill
- Crow
- Crown-of-thorns starfish
- Crustacean
- Cub
- Cuckoo
- Curassow
- Curlew
- Cuscus
- Cusimanse
- Cuttlefish
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