Condoms were originally made of animal intestines or linen.
347
The male seahorse carries babies and 'gives birth' to them instead of the female.
7
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
When a drone bee mates with a queen, its ejaculation is so powerful that it can even be heard by the human ear.
5
Whales and dolphins can't taste anything other than salt.
11
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
Jumping fleas can accelerate 50 times faster than the space shuttle.
218