There's a young hippo and a 130+ year old tortoise in a Kenyan wildlife preserve who are best friends and they even sleep and play together.
40
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Cats recognise the voice of their owner, but never evolved to care.
22
A dog's naked behind leaves absolutely no bacteria when pressed against carpet.
250
Nicole Kidman is scared of butterflies.
65
Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
6