U.S. National Park Service

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In this undated photo, a female and immature bighorn walk in the Mojave National Preserve in San Bernardio County, Calif. The National Park Service says a proposed 6.5-square-mile solar development about a half-mile from the Mojave National Preserve would harm wildlife. (AP Photo/The Press-Enterprise, Mark Zaleski) MAGS OUT; MANDATORY CREDIT

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In this undated photo, a desert tortoise crawls in the Mojave National Preserve in San Bernardio County, Calif. The National Park Service says a proposed 6.5-square-mile solar development about a half-mile from the Mojave National Preserve would harm wildlife. (AP Photo/The Press-Enterprise, Stan Lim) MAGS OUT; MANDATORY CREDIT

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In this undated photo, burrowing owls looks on in Wildomar, Calif. The National Park Service says a proposed 6.5-square-mile solar development about a half-mile from the Mojave National Preserve would harm wildlife, such as the borrowing owl. (AP Photo/The Press-Enterprise, Stan Lim) MAGS OUT; MANDATORY CREDIT

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FILE - This undated handout photo provided by the National Park Service shows the inside of the deactivated Delta Nine Launch Facility near Wall, S.D., that is now open to the public. Failings exposed last spring at an Air Force nuclear missile base, described by one officer as “rot” in the ranks, were even worse than originally reported, according to documents obtained by The Associated Press. All the staff involved with missile operation at Minot Air Force Base, N.D., passed an inspection with a “marginal” rating, the equivalent of a D in school _ and that was only because of good marks received by people like cooks or facilities managers. The men and women entrusted with launch keys to 150 Minuteman 3 intercontinental ballistic missiles would have flunked. (AP Photo/National Park Service, File)

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National Park Service Superintendent Bob Vogel speaks at a press conference held at the Newseum for the 2014 National Cherry Blossom Festival, Washington, D.C., Tuesday, March 4, 2014. It was announced that the peak bloom for the cherry blossoms will be April 8-12 according to the National Park Service. (Andrew Harnik/The Washington Times)

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James Perry, chief of resource management with the National Park Service, right, speaks to reporters after announcing the peak cherry blossom dates at a press conference held at the Newseum for the 2014 National Cherry Blossom Festival, Washington, D.C., Tuesday, March 4, 2014. It was announced that the peak bloom for the cherry blossoms will be April 8-12 according to the National Park Service. (Andrew Harnik/The Washington Times)

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President of the National Cherry Blossom Festival Diana Mayhew stands off stage as James Perry, chief of resource management with the National Park Service, announces the peak cherry blossom dates at a press conference held at the Newseum for the 2014 National Cherry Blossom Festival, Washington, D.C., Tuesday, March 4, 2014. It was announced that the peak bloom for the cherry blossoms will be April 8-12 according to the National Park Service. (Andrew Harnik/The Washington Times)

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James Perry, chief of resource management with the National Park Service announces the peak cherry blossom dates at a press conference held at the Newseum for the 2014 National Cherry Blossom Festival, Washington, D.C., Tuesday, March 4, 2014. It was announced that the peak bloom for the cherry blossoms will be April 8-12 according to the National Park Service. (Andrew Harnik/The Washington Times)

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James Perry, chief of resource management with the National Park Service announces the peak cherry blossom dates at a press conference held at the Newseum for the 2014 National Cherry Blossom Festival, Washington, D.C., Tuesday, March 4, 2014. It was announced that the peak bloom for the cherry blossoms will be April 8-12 according to the National Park Service. (Andrew Harnik/The Washington Times)

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James Perry, chief of resource management with the National Park Service waits to give the peak blossom dates at a press conference held at the Newseum for the 2014 National Cherry Blossom Festival, Washington, D.C., Tuesday, March 4, 2014. It was announced that the peak bloom for the cherry blossoms will be April 8-12 according to the National Park Service. (Andrew Harnik/The Washington Times)

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EDITORS NOTE GRAPHIC CONTENT - This Thursday Feb. 20, 2014 photo released by the National Park Service shows pictures from a remote camera in the Santa Monica Mountains National Recreation Area that recently captured photos of a mountain lion identified as P-13 and her 10-month-old kittens, P-28 and P-30, feeding on a kill in Malibu Creek State Park, Calif. The three of them spent two nights sharing their meal of mule deer. (AP Photo/National Park Service)

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EDITORS NOTE GRAPHIC CONTENT - This Thursday, Feb. 20, 2014 photo released by the National Park Service shows pictures taken by a remote camera in the Santa Monica Mountains National Recreation Area that recently captured photos of a mountain lion identified as P-13 and her 10-month-old kittens, P-28 and P-30, feeding on a kill in Malibu Creek State Park, Calif. The three of them spent two nights sharing their meal of mule deer. (AP Photo/National Park Service)

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EDITORS NOTE GRAPHIC CONTENT This Wednesday Feb.19, 2014 photo released by the National Park Service shows pictures taken from a remote camera in the Santa Monica Mountains National Recreation Area that recently captured photos of a mountain lion identified as P-13 and her 10-month-old kittens, P-28 and P-30, feeding on a kill in Malibu Creek State Park, Calif. The three of them spent two nights sharing their meal of mule deer. (AP Photo/National Park Service)

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EDITORS NOTE GRAPHIC CONTENT This Thursday Feb. 20, 2014 photo released by the National Park Service shows pictures taken from a remote camera in the Santa Monica Mountains National Recreation Area that recently captured photos of a mountain lion identified as P-13 and her 10-month-old kittens, P-28 and P-30, feeding on a kill in Malibu Creek State Park, Calif. The three of them spent two nights sharing their meal of mule deer. (AP Photo/National Park Service)

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EDITORS NOTE GRAPHIC CONTENT This Thursday Feb. 20, 2014 photo released by the National Park Service shows pictures taken by a remote camera in the Santa Monica Mountains National Recreation Area that recently captured photos of a mountain lion identified as P-13 and her 10-month-old kittens, P-28 and P-30, feeding on a kill in Malibu Creek State Park, Calif. The three of them spent two nights sharing their meal of mule deer. (AP Photo/National Park Service)