Possible Robber Fly? preying on a male Chalk-Hill Blue butterfly. 27th-July-2012
I'm not sure, but I think this is a robber fly here, which I found preying on an unfortunate chalk-hill blue butterfly.
I only spotted it, because it whizzed past my ear, then landed close by. I got quite close to it several times, but each time it would take off and land again. Once it had literally sucked the life out of the butterfly, it discarded it, and flew off in search of its next victim, no doubt.