When you shave a guinea pig it looks like a little hippo.
19
Cats and dogs can hear ultrasound.
350
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6
Dolphins have names for one another.
18
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