Condoms were originally made of animal intestines or linen.
347
Gorillas can catch human colds and other illnesses.
205
The Basenji dog is the only dog that is not able to bark.
4
Only 3% of bird species have penises.
0
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
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