Baby elephants will suck on their trunks for comfort just like human babies suck on their thumbs.

The colossal squid has the largest eyes ever studies in the animal kingdom, measuring almost eleven inches, which is roughly the same size as a volleyball. In fact, researchers believe that they may be the largest eyes that ever existed.

Some sharks can live up to 100 years old. Although most of them live 20 to 30 years in the wild, some species, such as the spiny dogfish, live well beyond a hundred years.

Cats actually sweat through their paws. Cats do have sweat glands, but their skin is covered in fur, so the amount of cooling that the sweat glands can provide is minimal. The paw pads have the most sweat glands, so they mostly sweat there.

Rabbits have the ability to sleep with their eyes open. They go into a trance-like state, which is half-sleep. The benefit of this is in the wild; it allows them to get away from predators in a hurry.