The elephant brain weighs about 6,000g.
274
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
The reindeer is the only mammal that can see UV light.
17
There's a phone app called RoboRoach that allows you to remotely control a cockroach through a chip that you to manually implant into the unwitting critter.
10
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Denmark has twice as many pigs as there are people.
66
Sandy, an African Penguin, has been in 'love' with her keeper at the Nuremburg zoo since 1996.
34
Jaguars frequently get high by eating hallucinogenic roots, which also increases their senses for hunting.
6