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Anthomyia sp.
Pearl and black fly with clear, iridescent wings. The underside of the abdomen is yellow. The top of the abdomen is gray with horizontal black stripes. The thorax has a horizontal black stripe across it made up of spots. The eyes are large and red. The eyes of the male touch in the center where females don't.
Rock in backyard
"Larvae at least sometimes feed on mammal carcasses. Adults are attracted to mammal dung, also feeding on sugary fluids such as honeydew and sap from sapsucker wounds." - BugGuide