When you shave a guinea pig it looks like a little hippo.
19
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19