Cats recognise the voice of their owner, but never evolved to care.
22
The world’s largest frog, the Goliath frog, can grow over 13 inches in length and can jump up to 10 feet in a single bound.
8
Condoms were originally made of animal intestines or linen.
347
It has been estimated that a bite from a grizzly bear can crush a bowling ball.
11
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23