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段落1

This is Scientific American's 60-Second Science. I'm Marissa Fessenden. Got a minute?

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Baleen allows the non-toothed whales to strain seawater for their fish and crustacean prey.

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Alexander Werth of Hampden-Sydney College in Virgina avoided a Jonah-like journey and still managed to analyze how baleen works.

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Two kinds of whales sport baleen.

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Balaenid whales, such as the bowhead, have long, springy plates with a delicate fringe.

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They filter water continuously.

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Groove-throated whales such as humpbacks have dense baleen that looks like a folded accordion.

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They gulp water to feed.

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For the tests, Werth submerged racks of humpback and bowhead baleen in a flow tank.

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Plastic beads represented food.

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As water streamed by, filaments from neighboring baleen plates naturally twined together and trapped the beads.

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The bowhead's long fringe formed the more effective filter, perfect for catching tiny krill.

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But the humpback baleen still nabs plenty.

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The study is in the Journal of Experimental Biology.

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If you're going to be a massive carnivore without teeth, evolution has to be especially creative.

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Marissa Fessenden.

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