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
Dogs sometimes fake being sick to get attention.
26
Sheep, goats, octopuses, and toads have rectangular pupils.
7
A banana slug can be 6-8 inches and their erect penis can be just as long. Also, their penises emerge from their heads. After sex, banana slugs eat each others penises.
17
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
When dragonflies mate, their tails form a love heart.
22
The reindeer is the only mammal that can see UV light.
17
There was a bear called Wojtek who was adopted by Polish soldiers during WW2. It carried ammunition, wrestled with soldiers, and drank beer.
40