Lobsters have blue blood.
476
The cat brain weighs about 30g.
167
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
In 1949, an official boxing match between a bear and a man was held. The bear won.
41
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 oldest recorded elephant lived for 82 years.
213
A cat rubs against people not only to be affectionate but also to mark out its territory with scent glands around its face. The tail area and paws also carry the cat's scent.
293
The seahorse is the only fish to have a neck.
12