The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
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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
Sheep, goats, octopuses, and toads have rectangular pupils.
7
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20
Squirrels forget where they hide about half of their nuts.
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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
Nervous dogs wag their tails to the left, and happy dogs to the right (from the dog’s point of view) – and fellow canines pick up on this lop-sided tail language.
10
The oldest known animal in the world was 'Ming' the 405 year old clam, discovered in 2007.
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