- Bicolor Sea Snake
- Birds waiting for feeding time
- Bison
- Bison
- Bittern
- Black and White Warbler
- Black Bear
- Black Horse
- Black Persian 'Minnie'
- Black Rat
- Black Tern
- Black-capped Chickadee
- Blacksmith shoeing horse
- Blesbok
- Blind mouse
- Blue Grosbeak
- Blue Jay
- Blue-gray Gnatcatcher
- Blue-winged Teal
- Bobcat
- Bobwhite
- Bony skeleton of Hippopotamus
- Bosch master
- Boy and Girl feeding a horse
- Boy and girl feeding the horses
- Boy feeding donkey
- Bridgehead Lizard
- Bridgeworms - a) Bonellia viridis. B) Phascolosoma vulgare. C) Priapulus caudatus
- Bringing the horse to his knees
- Bronzed Grackle
- Brown Creeper
- Brown Horse
- Brown horse and foal
- Brown Lemming
- Brown Rat
- Brown Tabby with the black bars far too wide
- Brown Thrasher
- Brown-headed Cowbird
- Bucked off
- Bucking Horse
- Bull Buffalo in National Museum Group
- Butter fish
- Butterfly
- Callianassa stebbingi (Female), a Sand-burrowing Thalassinid from the South Coast of England
- Calliphora erythrocephala
- Calocalanus pavo, One of the Free-swimming Copepoda of the Plankton
- Camel
- Canada Geese
- Canada Goose
- Cape Buffalo
- Cardinal
- Caribou
- Carolina Wren
- Cartoon Cat
- Casuarius uniappendiculatus
- Cat
- Cat and five kittens
- Cat and Kitten
- Cat and Kittens
- Cat and three kittens