The difference between antlers and horns is that antlers are shed each year and are made of bone while horns are kept for life and are made of living tissue and bone with a sheath that is very similar to human finger nails.
10
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
There was a bear called Wojtek who was adopted by Polish soldiers during WW2. It carried ammunition, wrestled with soldiers, and drank beer.
40
When Washoe, the first chimp to use sign language, was told that her caretaker's baby had died, she signed "CRY."
20
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