A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Gorillas can catch human colds and other illnesses.
205
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
Alligator snapping turtles can live for over 150 years. Scientists know this because some of the turtles had musket balls in their stomachs.
271
A dairy cow can produce more milk when listening to music.
446
The cat brain weighs about 30g.
167