Wolsingham, Weardale Adult dung flies chew hoverflies like hotdogs, but many fall victim to an insect-eating fungus
Cattle had been sheltering in the lee of the hedge and had spattered the footpath with fresh cowpats. We had to be careful where we put our feet, but the male dung flies, Scathophaga stercoraria, sitting in the centre of these discs of ordure, had no such reservations; these were their courtship arenas. Each suitor, resplendent in golden hairs that glowed in the early morning sunlight, was waiting for the arrival of females – usually found to be in short supply.
Dung flies’ behaviour and their sex lives have intrigued evolutionary biologists. Males vary in size and females tend to choose the largest mates available on the cowpat, with multiple mating being the norm. It’s a situation where large males, which tend to be more fecund, should prosper.
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Source: Guardian Environment