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

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In the 1960s submarine teams in the Southern Ocean first heard.

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The sound reminded the submariners of a duck.

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So they dubbed the mysterious sound the bio-duck.

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Since then, scientists have frequently recorded the bio-duck sound in Antarctic waters.

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But its source remained unknown. Until now.

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In 2013 researchers attached sensors to two Antarctic minke whales.

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The tags could track depth and location and also record vocalizations.

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Over a combined total of 26 hours, 32 calls were captured—including some low-pitched pulses.

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Some of which matched recordings made nearby of the bio-duck sound.

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The minke whale is thus revealed to be the source of the decades-old unidentified bio-duckitude.

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The work is in the journal Biology Letters.

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Because minke whales swim in icy Antarctic waters, they're difficult to monitor, especially in winter.

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But by analyzing the collection of bio-duck sounds recorded over the decades, researchers may now be able to track their population size and migration patterns.

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But perhaps the bigger lesson: if it quacks like a duck... maybe it's a whale.

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

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