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In New Guinea in 1976 I put out some banana for bait to trap beetles but it was mainly attractive to Drosophilids. However the larvae of these when they hatched were unlike any that I've ever heard of. If disturbed they would contract into a small blob then suddenly leap into the air as if a coiled spring had been released for about 20cm or more with an audible pop! I've puzzled about them for years and wonder if there is anyone out there familiar with this habit in flies?