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The Boston Globe

Nation

Drones migrate from battlefields to fields

Scientists retrofit technology, monitor wildlife

MONTE VISTA NATIONAL WILDLIFE REFUGE, Colo. — An electric whir filled the air of this high desert valley as Jeff Sloan, a cartographer for the US Geological Survey, hurled a small remote-controlled airplane into the sky.

The plane, a 4½-pound AeroVironment Raven, dipped; then its plastic propeller whined and pulled it into the sky.

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