Kevin Wilson, an aquatic ecologist with the National Park Service, prepares his scuba diving gear along with other divers and researchers for a biannual count of the Devils Hole pupfish at Devils …

Kevin Wilson, an aquatic ecologist with the National Park Service, prepares his scuba diving gear along with other divers and researchers for a biannual count of the Devils Hole pupfish at Devils Hole in the Ash Meadows National Wildlife Refuge on Saturday, April 7, 2018. Patrick Connolly Las Vegas Review-Journal @PConnPie