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They were very very common along the shores of the river Tomebamba in Cuenca, Andes of Ecuador. But they're very wary and difficult to approach, flying easily when disturbed. They always land in low plants, almost never in stones or soil. The river is contaminated and full of garbage. The surroundings are a lawn of grass with scattered trees and then the city. Size of the fly was similar to a housefly. Photographed on 5th October.