Two mating flies, Sicus ferrugineus (Thick-headed Fly)
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Two mating flies.
Making the photograph was not easy. The male was continously chased by other males. The couple would fly away in tandem, but competing males would try to dislodge the mating male, so that there could be a cluster of four flies tumbling around and flying away. After a while another male came out on top, but then a fight with new competitors started all over gain