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 hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
The Basenji dog is the only dog that is not able to bark.
4
When you shave a guinea pig it looks like a little hippo.
19
The male seahorse carries babies and 'gives birth' to them instead of the female.
7