Penguins have a gland above their eye that turns saltwater into freshwater.
12
Cats recognise the voice of their owner, but never evolved to care.
22
Dogs have been man's pet for over 14,000 years.
224
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
23
Sifrhippus was a species of horse about the size of an average duck and roamed North America 56 million years ago.
2
An alligator can go through 2,000 to 3,000 teeth in a lifetime.
268
The most expensive dog in the world is the Tibetan Mastiff; worth $1.5 million.
2