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

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Beluga whales live in the world's cold northern seas, where they endure months of perpetual darkness.

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"So they have to use sound, rather than sight, in order to find their way around."

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That's Aran Mooney, a marine biologist at Woods Hole Oceanographic Institution, in Massachusetts.

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He says belugas have really fast hearing, too:

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"Sound underwater travels five times faster than it does in air.

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And so those guys have to basically perceive and utilize sound five times faster than we do."

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He and his colleagues traveled to Bristol Bay, Alaska, to test belugas' hearing in the wild.

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They captured seven belugas for routine physicals.

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And played them a series of frequencies, while measuring the whales' brain activity with electrodes.

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Turns out the whales' hearing was sharp, and similar to that of captive belugas.

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Which means they could appreciate sound ranging from about 4 kilohertz to 150, a frequency nearly eight times higher than the upper limit of our ears.

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The results are in The Journal of Experimental Biology.

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The older belugas tested in this survey still had decent hearing too.

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But that might not be the case for belugas living in noisier Cook Inlet, near Anchorage.

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"There's a lot of military activities, a lot of commercial activities in Cook Inlet, and those animals are known to be declining at a rate of about two percent per year.

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And we think noise is a major stressor to those animals."

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And now that researchers know what wild belugas should be able to hear,

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they can test Cook Inlet belugas, to see whether that underwater noise is, literally, deafening.

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Thanks for the minute, for Scientific American 60-Second Science.I'm Christopher Intagliata.

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

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Beluga whales live in the world's cold northern seas, where they endure months of perpetual darkness.

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"So they have to use sound, rather than sight, in order to find their way around."

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That's Aran Mooney, a marine biologist at Woods Hole Oceanographic Institution, in Massachusetts.

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He says belugas have really fast hearing, too:

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"Sound underwater travels five times faster than it does in air.

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And so those guys have to basically perceive and utilize sound five times faster than we do."

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He and his colleagues traveled to Bristol Bay, Alaska, to test belugas' hearing in the wild.

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They captured seven belugas for routine physicals.

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And played them a series of frequencies, while measuring the whales' brain activity with electrodes.

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Turns out the whales' hearing was sharp, and similar to that of captive belugas.

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Which means they could appreciate sound ranging from about 4 kilohertz to 150, a frequency nearly eight times higher than the upper limit of our ears.

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The results are in The Journal of Experimental Biology.

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The older belugas tested in this survey still had decent hearing too.

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But that might not be the case for belugas living in noisier Cook Inlet, near Anchorage.

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"There's a lot of military activities, a lot of commercial activities in Cook Inlet, and those animals are known to be declining at a rate of about two percent per year.

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And we think noise is a major stressor to those animals."

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And now that researchers know what wild belugas should be able to hear,

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they can test Cook Inlet belugas, to see whether that underwater noise is, literally, deafening.

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Thanks for the minute, for Scientific American 60-Second Science.I'm Christopher Intagliata.

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