A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Mahatma Gandhi used to travel with his goat so that he could have fresh milk.
11
There is a sea snail that wears a suit of iron plated armor. It is the only known animal to use iron sulphide as skeletal material.
9
The Pistol Shrimp can snap its claws together to create a sound of 218 decibels, louder than as supersonic jet at full speed. It only lasts for 1 millisecond. The snapping action also creates a bubble that is greater than 5000 Kelvin, close to the surface temperature of the sun.
21
The largest breed of rabbit is the Flemish Giant.
65
In 1949, an official boxing match between a bear and a man was held. The bear won.
41
Using a remote-controlled camera, biologists caught dolphins getting high by sucking on puffer fish. They were even caught passing the puffer fish around.
23