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The razorback sucker is native to the Colorado River basin and was listed as an endangered species in 1991. According to the National Park Service, populations are currently in decline throughout the Colorado River basin. (Photo/NPS)

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The species was listed as endangered in 1991, however, the U.S. Fish and Wildlife Service proposed downlisting the razorback sucker to threatened last summer.

By By Joe Giddens, Williams-Grand Canyon News May 17, 2022