A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Travis was a chimpanzee who socialized with humans since birth. He could log onto a computer to look at pictures, watch TV using a remote control, brush his teeth, feed hay to his owner's horses, water plants, and learned the schedule of passing ice cream trucks.
11
Cows can sleep standing up, but they can only dream lying down.
745
The oldest creature ever found was Ming the clam at an admirable 507 years old.
16