An alligator can go through 2,000 to 3,000 teeth in a lifetime.
268
In 1949, an official boxing match between a bear and a man was held. The bear won.
41
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
The reindeer is the only mammal that can see UV light.
17
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