This undated photo provided by the U.S. Fish and Wildlife Service shows a humpback chub in the Colorado River basin in Grand Canyon National Park in Arizona. The USFWS said Thursday, March 22, 2018 that it no longer considers the fish on the brink of extinction and will consider reclassifying the humpback chub as threatened within the next year. Federal officials say managing the flow of water from dams on the river and its tributaries, and removing fish that feed on humpback chub have helped boost numbers. But they say the species won't fully recover without more work. (Travis Francis/U.S. Fish and Wildlife Service via AP)
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