CBS– Federal authorities took most humpback whales off the endangered species list Tuesday, saying their numbers have recovered through international efforts to protect the giant mammals.

However, four distinct populations remain endangered and one is now listed as threatened, some of which inhabit U.S. waters. The Central America population, which feeds off the West Coast, and the Western North Pacific population, which inhabits the Bering Sea and Aleutian Islands, are still endangered. The Mexico population, which feeds off the West Coast and Alaska, is threatened.

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