A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
World's heaviest primates: morbidly obese humans. After that: gorillas at 485 lbs.
106
Black bears are not always black. They can be brown, cinnamon, yellow, and sometimes white.
32
Kittens are born both blind and deaf.
25
Dolphins have names for one another.
18
A 4-foot walrus penis bone sold at auction in 2007 for $8,000.
202
The pea aphid insect explodes itself thereby sacrificing its life to protect its relatives from predators.
3