Mexican Cactus Fly (a syrphid fly — family syrphidae) on a Sunflower. LA Arboretum, Arcadia, California, USA. October, 2025. OM System OM-1 + M.Zuiko 300mm F4 #laarboretum #syrphidae #insect #insectphotography #nature #naturephotography #amateurphotography #photography #omsystem #om1 #mzuiko300mmf4