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The Peacock Fly, Callopistromyia annulipes, is a unique fly in the family Ulidiidae, which includes Picture-winged Flies. Callopistromyia annulipes holds its wings in a perpendicular orientation in relationship to its body. It opens and spreads the wings while they are perpendicular, and shuffles back and forth at the same time. This provides a spectacular display.
Found displaying on a Black Locust, Robinia pseudoacacia.