Kevin Wilson, an aquatic ecologist with the National Park Service, descends toward the water of Devils Hole for a biannual count of the Devils Hole pupfish in the Ash Meadows National Wildlife Ref …

Kevin Wilson, an aquatic ecologist with the National Park Service, descends toward the water of Devils Hole for a biannual count of the Devils Hole pupfish in the Ash Meadows National Wildlife Refuge on Saturday, April 7, 2018. Patrick Connolly Las Vegas Review-Journal @PConnPie