Cats are one of the only animals to domesticate themselves and approach humans on their own terms.
20
The Savannah is the largest domestic cat breed. It resembles a small leopard and behaves like a dog. They can grow up to 40 lbs, have an eight foot vertical jump, and can be trained to walk on a leash and play fetch.
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
It has been calculated that a single breath from a mature blue whale can inflate up to 2,000 balloons.
492
Gorillas can catch human colds and other illnesses.
205