Dogs sometimes fake being sick to get attention.
26
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
Crows living in some urban areas drop nuts into traffic to let the passing cars crush them, then they wait for the red lights to stop the traffic so they can grab and eat it.
17
Cats sleep for 70% of their lives.
8
Some older/less efficient worker termites will develop 'backpacks' of toxic chemicals that explode when the termite is threatened. They are essentially used as suicide bombers when the colony is being attacked.
8
Jumping fleas can accelerate 50 times faster than the space shuttle.
218
It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
109