Whales roam throughout all of the world's oceans, communicating with complex and mysterious sounds. Their sheer size amazes us: the blue whale can reach lengths of more than 100 feet and weigh up to 200 tons—as much as 33 elephants.

Despite living in the water, whales breathe air. And like humans, they are warmblooded mammals who nurse their young. A thick layer of fat called blubber insulates them from cold ocean waters.