This June 14, 2016, photo provided by the National Park Service shows Condor chick #828, left, with her father, Condor #340 in her nest at 60 days of age in Pinnacles National Park, near Paicines, Calif. The California condor chick has hatched in the wild, survived and flown out of its nest at Pinnacles National Park for the first time since the 1890s, officials said Wednesday, Oct 12, 2016. (Gavin Emmons/National Park Service via AP)
This June 14, 2016, photo provided by the National Park Service shows condor chick 828 in her nest at 60 days of age in Pinnacles National Park near Paicines, Calif. The California condor chick has hatched in the wild, survived and flown out of its nest at Pinnacles National Park for the first time since the 1890s, officials said Wednesday, Oct 12, 2016. (Gavin Emmons/National Park Service via AP)
FILE - This Aug. 26, 2016 file photo provided by the National Park Service shows tire tracks made by a vehicle illegally crossing the Racetrack Playa at Death Valley National Park, Calif. Federal investigators have identified a motorist suspected of taking the illegal joyride on the dry lake bed in Death Valley National Park, leaving 10 miles of swerving tire tracks. Officials have not released the suspect's name. (National Park Service via AP,File)
Friends of the World War II Memorial, the National Park Service and the Military District of Washington host a Veterans Day commemoration at the World War II Memorial on the morning of Veterans Day, Washington, D.C., Tuesday, November 11, 2014. (Andrew Harnik/The Washington Times)
Friends of the World War II Memorial, the National Park Service and the Military District of Washington host a Veterans Day commemoration at the World War II Memorial on the morning of Veterans Day, Washington, D.C., Tuesday, November 11, 2014. (Andrew Harnik/The Washington Times)
In a Thursday, July 31, 2014 photo, Eric Wood, assistant crew chief with Trails Forever, chisels the edge of a rock before it's used as a walking path on the Chimney Tops Trail in the Great Smoky Mountains National Park near Gatlinburg, Tenn. National Park Service staff and volunteers are reconstructing the popular trail after years of erosion. (AP Photo/Knoxville News Sentinel, Kevin Martin)
This undated image provided by the National Park Service shows an eagle nest. Officials say bald eagles continue to expand their range in Southern California's Channel Islands, where a nesting pair has been found on San Clemente Island for the first time in more than 50 years. (AP Photo/National Park Service)
CORRECTS YEAR IMAGE WAS TAKEN TO 2013, NOT 2003 - In this photo taken on 2013 and released by the National Park Service, Philip Doepke, a fisheries biologist at Yellowstone National Park, holds a netted lake trout caught from Yellowstone Lake in Wyoming. Scientists say they voracious species of trout that entered Yellowstone Lake and decimated its native trout population appears to be in decline following efforts to kill off the invading fish. (AP Photo/National Park Service)
CORRECTS YEAR IMAGE WAS TAKEN TO 2013, NOT 2003 - In this photo taken in 2013 and released by the National Park Service. Brian Ertel, a fisheries biologist at Yellowstone National Park, holds a netted lake trout caught from Yellowstone Lake in Wyoming. Scientists say they voracious species of trout that entered Yellowstone Lake and decimated its native trout population appears to be in decline following efforts to kill off the invading fish. (AP Photo/National Park Service)