Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
The CIA once spent $20 million on a cat equipped with gear to spy on the Soviets, but it was hit by a taxi.
328
Dogs have been man's pet for over 14,000 years.
224
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
Honeypot ants are a unique insect that use their own bodies as living storage pots of honey.
4
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17