Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
The Basenji dog is the only dog that is not able to bark.
4
Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20
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
Penguins have a gland above their eye that turns saltwater into freshwater.
12
The difference between antlers and horns is that antlers are shed each year and are made of bone while horns are kept for life and are made of living tissue and bone with a sheath that is very similar to human finger nails.
10
Cats recognise the voice of their owner, but never evolved to care.
22