Dolphins can rapidly heal from extreme injuries, such as shark bites, and regenerate their original body shape.
19
Cows can sleep standing up, but they can only dream lying down.
745
Dogs have been man's pet for over 14,000 years.
224
A cat rubs against people not only to be affectionate but also to mark out its territory with scent glands around its face. The tail area and paws also carry the cat's scent.
293
Cows as they are today never existed in the wild and were domesticated from aurochs some 10,500 years ago.
6
Vampire bats adopt orphans, and are one of the few mammals known to risk their own lives to share food with less fortunate roost-mates.
402
The largest earthworm on record was found in South Africa and measured 22 feet.
151
Some lizards, in which the tail is a major storage organ for accumulating reserves, will return to a dropped tail after the threat has passed, and will eat it to recover part of the sacrificed supplies.
13