When dragonflies mate, their tails form a love heart.
22
Mosquitoes prefer certain blood types, and people with the “O” blood type are more likely to get bitten.
12
There is a sea snail that wears a suit of iron plated armor. It is the only known animal to use iron sulphide as skeletal material.
9
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 Australia, there are spiders big enough to eat snakes.
20
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20