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On the Brink: Animals Fighting for Survival

Photography by Joel Sartore | Captions by Della Watson

The yellowfin madtom is a type of small catfish native to the Tennessee River Valley, and today it can be found in only a handful of streams. Water pollution and habitat disruption have reduced the fish's population to approximately 8,300 individuals, 800 of which live in captivity. (Photographed at Conservation Fisheries Inc., Knoxville, Tennessee)

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