Jellyfish as a species are actually older than dinosaurs and sharks.
383
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
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6