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In this April 18, 2004 photo provided by the U.S. Fish and Wildlife Service a walrus cow and her calf sit on the ice in Alaska. The U.S. Fish and Wildlife Service, part of the Interior Department, has until Saturday, Sept. 30, 2017, to decide whether Pacific walrus should be listed to the threatened species list because of threats to its habitat, sea ice, due to climate warming. (Joel Garlich-Miller/USFWS via AP)

In this April 18, 2004 photo provided by the U.S. Fish and Wildlife Service a walrus cow and her calf sit on the ice in Alaska. The U.S. Fish and Wildlife Service, part of the Interior Department, has until Saturday, Sept. 30, 2017, to decide whether Pacific walrus should be listed to the threatened species list because of threats to its habitat, sea ice, due to climate warming. (Joel Garlich-Miller/USFWS via AP)

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