A duck's quack doesn't echo, and no one knows why.
173
When the "Elephant Whisperer" Lawrence Anthony died, a whole herd of elephants arrived at his house to mourn him.
25
Over one million stray dogs live in the New York City metropolitan area.
-10
A male baboon can kill a leopard.
38
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Cats and dogs can hear ultrasound.
350
A full-grown bear can run as fast as a horse.
35