Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
Female kangaroos have three vaginas.
2
Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
34
A 42-foot sperm whale has about 7 tons of oil in it.
209
Sergeant Stubby was the only war dog to be promoted to sergeant through combat in WWI. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and even once caught a German spy by the seat of his pants, holding him there until American Soldiers found him.
16
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6