Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
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
Squirrels forget where they hide about half of their nuts.
698
Some lizards, in which the tail is a major storage organ for accumulating reserves, will return to a dropped tail after the threat has passed, and will eat it to recover part of the sacrificed supplies.
13
A dog's naked behind leaves absolutely no bacteria when pressed against carpet.
250
Sheep, goats, octopuses, and toads have rectangular pupils.
7