A dork is a whale's penis.
327
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
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
Whales and dolphins can't taste anything other than salt.
11
Ants have tiny magnetic compasses in their antennae which help them navigate.
9
Some lizards, in which the tail is a major storage organ for accumulating reserves, will return to a dropped tail after the threat has passed, and will eat it to recover part of the sacrificed supplies.
13
Female kangaroos have three vaginas.
2
Christmas Island has bridges for crabs to stop them getting run over during the mass migration.
9