Photo detail

This photo provided by The U.S. Geological Survey, the USGS THawk drone being used during a survey of abandoned solid waste in the Mojave Preserve on Wednesday, April 3, 2013. The U.S. Geological Survey started using unmanned aircraft for wildlife and land management work about two years ago. Its first Nevada mission, planned for August or September, involves counting sheep and deer within the Desert National Wildlife Refuge north of Las Vegas. (AP Photo/Las Vegas Review-Journal, USGS)

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