The Basenji dog is the only dog that is not able to bark.
4
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
Sharks have been on the planet longer than trees.
14
A group of unicorns is called a blessing.
304
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Rattlesnake mating sessions have been known to last more than 22 hours.
232
Ants tend to survive in a microwave because they find the coolest spot and wait!
17