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This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?

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The fuzzy sure is cute.

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Until it opens its mouth.

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(Sound of koala vocalization.)

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The mating call of a male koala has roughly the same pitch as an elephant's trumpet.

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How does this tiny mammal produce such a low voice?

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Back in 2011, as a previous 60-Second Science explained, researcher Benjamin Charlton of the University of Sussex suspected the position of the voice box was responsible.

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Now, Charlton and his team have discovered an entirely new organ may be the source.

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In most mammals, sound is produced when air passes through the voice box and vibrates its inner membranes, called vocal folds.

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But male koalas have an extra set of vocal folds, located in their throats but outside their voice boxes.

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These velar vocal folds are three times longer than the pair in the voice box and weigh 683 times more.

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The work is published in Current Biology.

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Large and heavy velar vocal folds let male koalas bellow at low frequencies.

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So they can draw in lady koalas, who think a low voice is highly attractive.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.

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