There's a rare breed of pig that looks like a sheep.
14
Some lizards, in which the tail is a major storage organ for accumulating reserves, will return to a dropped tail after the threat has passed, and will eat it to recover part of the sacrificed supplies.
13
In just about every species of mammal, the female lives longer than the male.
43
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
When a drone bee mates with a queen, its ejaculation is so powerful that it can even be heard by the human ear.
5
The lifespan of mammals is about 1 and a half billion heartbeats.
127
The Jewel Wasp injects a drug into a cockroach’s brain, turns it into a zombie, rides it like a horse back to its burrow, and then lets its hatched larvae feed on the cockroaches body from the inside.
6
Travis was a chimpanzee who socialized with humans since birth. He could log onto a computer to look at pictures, watch TV using a remote control, brush his teeth, feed hay to his owner's horses, water plants, and learned the schedule of passing ice cream trucks.
11