The Basenji dog is the only dog that is not able to bark.
4
Jumping fleas can accelerate 50 times faster than the space shuttle.
218
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
Gorillas can catch human colds and other illnesses.
205
Sheep, goats, octopuses, and toads have rectangular pupils.
7
If a vampire bat goes 2 days without drinking blood, they can die. However, well fed female bats will puke up blood and share it with other bats that they like in exchange for grooming.
13