Condoms were originally made of animal intestines or linen.
347
Tigers can see 6 times better at night than humans.
305
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
Lobsters have blue blood.
476
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
An Indian man known as "Snake Manu" can put small snakes, including deadly cobras, into his mouth and pass them out through his nose.
59