The sound of a tiger's roar can travel a distance of up to 2 miles (~3 km).
255
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
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
A newborn Chinese water deer is so small, it can (almost) be held in the palm of a hand.
13