How the black-footed ferret is making a comeback from the brink of extinction 

When President Nixon signed the Endangered Species Act into law 50 years ago, one of the first on the endangered list was the black-footed ferret, North America’s rarest animal. Once thought to be extinct, they are making their way back thanks to the work of dedicated conservationists. John Yang reports on some of that work for our ongoing series, “Saving Species.”
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