- cerastes
- cestoid
- chaffinch
- char
- centipede
- ceratodus
- cere
- cestode
- cetacian
- chameleon
- chap
- chamois
- charr
- cheetah
- cheiropterous
- chela
- chicken-prairie
- chigoe
- chimpanzee
- chiropter
- chiroptera
- chitin
- chitter
- cheiropteran
- chelae
- chicken-snake
- chinchilla
- chipmuck
- chipmunk
- chiton
- chops
- chordata
- cirriferous
- cirriped
- cirrus
- civet
- chough
- cicada
- cigala
- cimex
- cirri
- cirripede
- clam
- click-beetle
- clupeid
- clypeal
- climber
- cobra
- cochineal insect
- cockatoo
- cockchafer
- cocker
- cockle
- cockroach
- codding
- coelacanth
- coelenterata
- coleopterous
- colembolan
- coleoptera
- colony
- colubrid
- coluber
- conch
- conchiferous
- condor
- cone
- coot
- copepod
- copperhead
- coquette
- coon
- cormorant
- coronate
- coronated
- corral
- corselet
- corslet
- cotton-tail
- cougar
- cow-bird
- cow-fish
- cowrie
- cover
- coyote
- crake
- cramp-fish
- crane
- crawler
- crepuscular
- criket
- crinoid
- crop
- crucian
- crustacean
- culver
- cross
- cross-bill
- curvirostrate
- cuscus