Early American humans hunted car-size armadillos and used their shells for houses.
12
Cats and dogs can hear ultrasound.
350
Sloths take two weeks to digest their food.
243
When a drone bee mates with a queen, its ejaculation is so powerful that it can even be heard by the human ear.
5
The elephant brain weighs about 6,000g.
274
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6