Bats sleep 18-20 hours per day.
5
The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
255
Urechis unicinctus is a species of marine spoon worm that is widely referred to as the ‘penis fish’.
2
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6
It's possible to train your cat to use the toilet as a litter box and even flush afterwards.
109
When cats are happy, they may squeeze their eyes shut.
10
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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