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
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Dogs sometimes fake being sick to get attention.
26
The elephant brain weighs about 6,000g.
274
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13
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