A lion in the wild usually makes no more than twenty kills a year.
186
An alligator can go through 2,000 to 3,000 teeth in a lifetime.
268
Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
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
Jumping fleas can accelerate 50 times faster than the space shuttle.
218
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The ancestor of all domestic cats is the African Wild Cat which still exists today.
12