World's heaviest primates: morbidly obese humans. After that: gorillas at 485 lbs.
106
The heart of a mouse beats 650 times per minute!
53
A bird 'chews' with its stomach.
33
A giraffe can clean its ears with its 21-inch tongue!
31
Squirrels will sometimes adopt orphaned baby squirrels that they’re related to.
12
Spiders have transparent blood.
56
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
A scorpion can hold its breath for up to 6 days.
19