Ants have tiny magnetic compasses in their antennae which help them navigate.
9
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
One reason that kittens sleep so much is because a growth hormone is released only during sleep.
212
The male seahorse carries babies and 'gives birth' to them instead of the female.
7