Right whales and bowhead whales feed on small marine animals called krill by using their baleen. They do this by taking in water and krill as they open their large mouth. Next, they close their mouth most of the way, until only the baleen is exposed between their lips at the sides of the mouth, like a sieve (SIV). Then they push the water through the baleen and out between their lips, but the krill are trapped in the baleen and are left in the whale's mouth. By scraping the baleen with their huge tongue, the whales are able to swallow the food that is left after the water rushes out.
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