File-This undated file photo provided by the U.S. Fish and Wildlife Service shows a wolverine. A top federal wildlife official says there's too much uncertainty about climate change to prove it threatens the snow-loving wolverine, overruling agency scientists who warned of impending habitat loss. (AP Photo/U.S. Fish and Wildlife Service, File)
This remote camera photo taken May 4, 2014 and provided by the U.S. Fish and Wildlife Service, shows a black wolf that appears to be a female in the same area as the wolf OR7 in southwest Oregon’s Cascade Mountains. Oregon's famous wandering wolf, OR-7, may have found the mate he has trekked thousands of miles looking for. Wildlife authorities said Monday, May 12, 2014, that cameras on the Rogue River-Siskiyou National Forest in the southern Cascades captured several images of what appears to be a black female wolf in the same area where OR-7's GPS collar shows he has been living. (AP Photo/USFWS)
This remote camera photo taken May 3, 2014 and provided by the U.S. Fish and Wildlife Service, shows the wolf OR7 in southwest Oregon’s Cascade Mountains. Oregon's famous wandering wolf, OR-7, may have found the mate he has trekked thousands of miles looking for. Wildlife authorities said Monday, May 12, 2014, that cameras on the Rogue River-Siskiyou National Forest in the southern Cascades captured several images of what appears to be a black female wolf in the same area where OR-7's GPS collar shows he has been living. (AP Photo/USFWS)
FILE -- This undated file photo from the U.S. Fish and Wildlife Service shows a portion of the Bandon Marsh National Wildlife Refuge outside Bandon, Ore., where a 400-acre salt marsh restoration has produced hordes of mosquitoes that have tormented local residents, visiting golfers and and campers. Pressed by advocacy groups, the U.S. Fish and Wildlife Service has dropped plans to spray chemical pesticides to kill mosquitoes breeding on the refuge. Instead, the agency will use a biological pesticide that poses less risk to the crabs, crawfish and worms that fish and wildlife depend on for food. (AP Photo/U.S. Fish and Wildlife Service, Roy W. Lowe)
FILE -- This undated file photo from the U.S. Fish and Wildlife Service shows a portion of the Bandon Marsh National Wildlife Refuge outside Bandon, Ore., where a 400-acre salt marsh restoration has produced hordes of mosquitoes that have tormented local residents, golfers and and campers. Pressed by advocacy groups, the U.S. Fish and Wildlife Service has dropped plans to spray chemical pesticides to kill the mosquitoes. Instead, the agency will use a biological pesticide that poses less risk to the crabs, crawfish and worms that fish and wildlife depend on for food. (AP Photo/U.S. Fish and Wildlife Service)
FILE - This April 18, 2008, file photo provided by the U.S. Fish and Wildlife Service shows a gray wolf. The California Fish and Game Commission on Wednesday April 16, 2014, will consider listing the gray wolf as an endangered species. The wolf has been absent from California since the 1920s, but the appearance of a lone wolf in recent years in the north state has advocates pushing for protection in the hope that it will return in greater numbers. (AP Photo/U.S. Fish and Wildlife Service, Gary Kramer, File)
This April 18, 2008, file photo provided by the U.S. Fish and Wildlife Service shows a gray wolf. (AP Photo/U.S. Fish and Wildlife Service, Gary Kramer, File)
In this Jan. 5, 2003, photo released by U.S. Fish and Wildlife Service shows a black rhino male and calf in Mkuze, South Africa. Hunt the black rhino to save the black rhino. That's the Dallas Safari Club's approach to a fundraiser for efforts to protect the endangered species. The group hopes to raise more than $200,000 Saturday by auctioning off the right to shoot and kill a black rhinoceros in the African nation of Namibia. (AP Photo/U.S. Fish and Wildlife Service, Karl Stromayer, File)