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
Sergeant Stubby was the only war dog to be promoted to sergeant through combat in WWI. He saved his regiment from surprise mustard gas attacks, found and comforted the wounded, and even once caught a German spy by the seat of his pants, holding him there until American Soldiers found him.
16
Anteaters prefer termites to ants.
18
Macaques monkeys in Japan learned to steal purses and wallets, take out the coins, and use them to buy drinks and snacks from vending machines.
26
Sharks have been on the planet longer than trees.
14
Cattle are the only mammals that pee backwards.
33
Turkeys can reproduce without having sex.
121
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23