How big are blue whales?


Quick Answer

Blue whales weigh approximately 200 tons and can grow to a length of between 82 and 105 feet. They are the largest mammals to have ever lived on earth.

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Full Answer

The heart of an adult blue whale alone can weigh as much as a car. Blue whale calves are born already weighing 3 tons and at a length of about 25 feet. A blue whale calf gains about 200 pounds every day for the first year of its life. Blue whales reach this enormous size with a diet comprised mostly of tiny animals called krill, which they eat at a rate of up to four tons per day.

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