Female kangaroos have three vaginas.
2
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
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9
The octopus does not have a blind spot.
273
Sharks have been on the planet longer than trees.
14
Rattlesnake mating sessions have been known to last more than 22 hours.
232