Cows can sleep standing up, but they can only dream lying down.
745
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
A lion in the wild usually makes no more than twenty kills a year.
186
Bats sleep 18-20 hours per day.
5
A giraffe's kick is so powerful that it can decapitate a lion.
216
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