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Walrus, which suck clams out of their shells with piston-like tongues, use sea ice as a resting spot between dives to the ocean floor. In recent years, people have seen more walruses using shorelines as haul-out spots; U.S. Geological Survey scientists counted 131 carcasses at one of these sites in September 2009. They wrote that the deaths, perhaps because of exhaustion or trampling, “appear to be related to the loss of sea ice over the Chukchi Sea continental shelf.”
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