Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
Cows can sleep standing up, but they can only dream lying down.
745
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
Drivers kill more deer than hunters do.
660
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12