Black-footed ferrets, one of the first animal species to be listed as endangered 45 years ago, have been spotted outside of special protected areas in South Dakota. The discovery raised hopes among biologists for the future of the rare mammal, which was reintroduced only to later suffer large losses to plague. "I've been in the business for 40 years, and this is only the second time in my life that I've ever seen a black-footed ferret," said Standing Rock Sioux Tribe biologist Barry Betts.

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