blood-sucking fly on the door of her car escaped a nasty bite by chasing it away with a towel.The dark giant horsefly was discovered by Nicola Harrison during a visit to Corrie, Arran, on Thursday afternoon.She quickly snapped a picture of the terrifying beastie - which was around 2.5cm long - before safely coaxing it onto a towel.In a bid to find out what the insect actually was, she turned to the Arran Ranger Service for help.She soon discovered that she had been lucky to escape a painful bite