- Cat asleep on a chair
- Cat at Show
- Cat cleaning itself
- Cat Face
- Cat Family
- Cat Hunting
- Cat in tree
- Cat licking a kitten
- Cat looking at reflection in the water
- Cat on a fence
- Cat on a wall
- Cat on an old book
- Cat sitting on some cloth
- Cat watching Mouse hole
- Cat with kittens
- Catbird
- Catching a bear
- Catching wolves
- Cedar Waxwing
- Centipede
- Central Asiatic Sandgrouse (Syrrhaptes paradoxus)
- Chameleon
- Checkerboard and Viper-colored Swim Snake
- Cherries
- Child looking after horse
- Chimney Swift
- chimpanzee
- Chinch Bug
- Chipmunk
- Chipping Sparrow
- Chirote
- Chiton squamosus
- Chrysalis of Tomato Worm
- Chrysomyia macellaria
- Cirolana borealis
- Cliff Swallow
- Cockle
- Common Crayfish
- Common Crow
- Common Deer or Red Deer
- Common Earthworm
- Common Frog - showing tongue in action
- Common Lizard
- Common Lobster
- Common Mallard
- Common Water Spider
- Conorhinus abdominalis
- Conorhinus sanguisugus
- Continental Bank Eagle
- Copilia quadrata (Female), a Copepod of the Family Corycæidæ
- Copper snake
- Coral red Coilsnake
- Coral Red Flake
- Cordylobia anthropophaga
- Cotswold
- Cow Parts
- cowslips
- Crested Flycatcher
- Cross section of foot of a horse
- Cross section of the larva of the browntail moth showing the tubercles bearing the poison hairs