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This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.

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The largest animal on Earth is thriving anew, at least off of California.

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And all it took was for people to stop hunting blue whales.

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That's according to a new study in Marine Mammal Science.

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Today, the California group of the mighty blue whales numbers roughly 2,200, according to conservationists and based on distinctive singing.

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That compares with the more than 3,000 killed over the first seven decades of the 20th century.

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The blue whale can grow up to 30 meters in length and weigh more than 180 metric tons,

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and requires for food each day roughly 40 million tiny sea creatures called krill.

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This may explain why the number of whales of California has stopped growing.

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Some conservationists had argued that individuals being hit and killed by ship traffic held back population growth.

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But the new research suggests it's more likely that California blue whales have reached the limits to growth in that region of the eastern Pacific Ocean.

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Of course, more than 350,000 blue whales were killed in other parts of the world in the 20th century.

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So the species has hardly recovered to its historical abundance.

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But, at least in California, the blue whale is back.

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Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.

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