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
The colossal squid has the largest eyes in the world.
4
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.
132
The elephant shrew’s closest relative isn’t a shrew — it’s actually an elephant
9
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212