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Habitat loss and disease in the American prairie pushed the black-footed ferret ​to the edge of extinction. Now these underground-dwelling mammals are making a comeback, through a captive-breeding program run by the U.S. Fish and Wildlife Service. There, baby ferrets-called kits-are raised and released into the wild.​

Scientists have cloned the first U.S. endangered species, a black-footed ferret duplicated from the genes of an animal that died over 30 years ago.