A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Drivers kill more deer than hunters do.
660
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
The octopus does not have a blind spot.
273
The colossal squid has the largest eyes in the world.
4
A tortoise named Adwaita lived to 255 years old. To put it into perspective, he was born before the United States of America existed and his death was announced on CNN (1750-2006).
12