Dire wolves actually existed, living up to 10,000 years ago before going extinct.
10
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
Bats sleep 18-20 hours per day.
5
Cows can sleep standing up, but they can only dream lying down.
745
The oldest known animal in the world was 'Ming' the 405 year old clam, discovered in 2007.
492