A male sage grouse struts in the early morning hours April 22, 2015 on a lek outside Baggs, Wyoming. Environmental groups sued Thursday, February 25, 2016, to force the Obama administration to impose more restrictions on oil and gas drilling, grazing and other activities blamed for the decline of greater sage grouse across the American West. (Photo by Dan Cepeda/The Casper Star-Tribune via AP Photo)
