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Drones are controversially employed to hunt down Islamic extremists in Afghanistan - but now wildlife conservationists have found a new use: spying on the nests of rare and endangered birds around the UK and beyond. The RSPB is developing the technology - Dr Richard Bradbury works for the RSBP Centre for Conservation Science. (Photo; A bittern, one of the birds which will be tracked by the drone. Credit: RSPB)