Condoms were originally made of animal intestines or linen.
347
Parrotfish make themselves a kind of mucus 'sleeping bag' which masks their smell from predators and keeps parasites away.
4
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6
The Lion's Mane Jellyfish is the largest jellyfish in the world. They have been swimming in arctic waters since before the dinosaurs (over 650 million years ago).
12
Urechis unicinctus is a species of marine spoon worm that is widely referred to as the ‘penis fish’.
2
It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
109