A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
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
A dog's naked behind leaves absolutely no bacteria when pressed against carpet.
250
A group of kittens is called a "kindle".
10
Bats sleep 18-20 hours per day.
5