- Belted Kingfisher
- Belted tail
- Bentheuphausia amblyops, from 1,000 fathoms
- berries of the bittersweet
- berries of the bittersweet
- Betty
- Bezoar goat
- Biceps Muscle in Action
- Bicolor Sea Snake
- Bird
- Bird 2
- Bird 3
- Bird 4
- Bird on a flower
- Birds waiting for feeding time
- Bison
- Bison
- Bison Calf, about three weeks old
- Bison surrounded by Wolves
- Bittern
- Bittern
- Black and White Warbler
- Black Bear
- Black cat grooming himself
- Black Horse
- Black kitten
- Black Mallard Ducks
- Black Mallards
- Black Persian 'Minnie'
- Black Rat
- Black Swan
- Black Tern
- Black Tern, Adult
- Black-brown Kite
- Black-capped Chickadee
- Blacksmith shoeing horse
- Blesbok
- Blind mouse
- Blossom of Cucurbita
- Blue Grosbeak
- Blue Jay
- Blue-gray Gnatcatcher
- Blue-winged Teal
- Bobcat
- Bobwhite
- Body of an insect
- Bolusanthus speciosus
- Bony skeleton of Hippopotamus
- Bosch master
- Boy and Girl feeding a horse
- Boy and girl feeding the horses
- Boy feeding donkey
- Brachinus Pursued by an Enemy
- Brahmin Bull
- Bridgehead Lizard
- Bridges’s Wood-Hewer
- Bridgeworms - a) Bonellia viridis. B) Phascolosoma vulgare. C) Priapulus caudatus
- Bringing the horse to his knees
- Bronzed Grackle
- Brown Cachalote