A cat rubs against people not only to be affectionate but also to mark out its territory with scent glands around its face. The tail area and paws also carry the cat's scent.
293
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
Cats recognise the voice of their owner, but never evolved to care.
22
Squirrels forget where they hide about half of their nuts.
698
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Mosquitoes don't just bite you, they also pee on you.
11
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
The difference between antlers and horns is that antlers are shed each year and are made of bone while horns are kept for life and are made of living tissue and bone with a sheath that is very similar to human finger nails.
10