Rattlesnake mating sessions have been known to last more than 22 hours.
232
Giant Anteaters' front legs look like a panda.
48
A cow produces around 200,000 glasses of milk in her lifetime.
373
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
255
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
The elephant brain weighs about 6,000g.
274