Did you know that the blue whale's heart is the size of a small car and its beat can be detected two miles away?

Blue whales are simply enormous with most ranging in length from 24-30 m. Blue whales mostly travel alone or in groups of 2-3. Larger groups of up to 60 whales have been reported and are probably associated with feeding grounds. However, the blue whale has the most powerful voice in the animal kingdom and its low-frequency sounds can travel in deep water over hundreds, or even thousands, of miles.

The blue whale has a truly global distribution, occurring in all oceans except the Arctic, and enclosed seas. But despite this, they are one of the rarest of the whales, numbering between 10,000-25,000. Most biologists consider them to be among the most endangered of the great whales. Like other large whales, blue whales are threatened by chemical and sound pollution, habitat loss, overfishing of krill, ship strikes and becoming entangled in fishing gear.Climate change could also have a major impact on its food supply, since global warming and associated ocean acidification may impact krill populations.