A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
The Basenji dog is the only dog that is not able to bark.
4
Baks the blind boxer has a seeing eye goose named Buttons; a four-year-old goose who leads the pup around everywhere either by hanging onto him with her neck, or by honking to tell him which way to go.
16
The oldest creature ever found was Ming the clam at an admirable 507 years old.
16
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
Bats sleep 18-20 hours per day.
5