Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
There wasn't a single pony in the Pony Express, just horses!
57
A killer whale's heart beats 30 times a minute under water, 60 times a minute on the surface.
30
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
When you shave a guinea pig it looks like a little hippo.
19
The most yolks ever found in one chicken egg was nine.
163
A banana slug can be 6-8 inches and their erect penis can be just as long. Also, their penises emerge from their heads. After sex, banana slugs eat each others penises.
17