Whales are the largest sea animal.
These two huge animal may,in fact, come from the same biological family.
Biologists now believe that the ancestors of elephants once lived in the sea, like whales.
There is plenty of evidence to support this idea.
For example, the shape of an elephant's head is similar to a whale's.
Another similarity is in the fact that both animals are excellent swimmers.
Some elephants have chosen to swim for food to islands up to 300 miles away.
Like the whale, the elephant uses sounds to show anger or for other kinds of communication.