Related Program: Science Utah 3. The Endangered Species Act By Niall Clancy • Mar 12, 2019 Related Program: Science Utah ShareTweetEmail An Endangered Desert Bighorn Sheep lamb Credit James Marvin Phelps The Endangered Species Act (ESA) is one of the most controversial pieces of legislation in the American West. This week, UPR's Niall Clancy explores the perceptions and realities of the ESA with the help of the University of Utah's Dr. Bob Keiter. Listen Listening... / 7:27 Listen here. The Endangered Rio Grande Silvery Minnow Credit U.S. National Park Service Tags: science utahEndangered speciesRobert KeiterRob BishopMitt RomneyNiall ClancyShareTweetEmailView the discussion thread.