Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Sharks, like other fish, have their reproductive organs in their chests.
248
Dolphins sometimes have fun by blowing bubbles and creating rings of air underwater, which they then swim through.
17
A domestic cat can sprint at about 31 miles per hour.
274
Bats sleep 18-20 hours per day.
5
The elephant brain weighs about 6,000g.
274
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
Dogs have been man's pet for over 14,000 years.
224