Flies of the family Muscidae are often called house flies or stable flies. These common names come from the tendency of some species to live in close association with humans (synanthropy). These flies feed on feces, blood, and decaying organic matter (like human trash). They can vector a large number of diseases, mostly through their feces. These muscid species are considered human pests.
Despite this, most muscid species aren’t synanthropic. The specimen above is one such species; it was photographed in the middle of a floodplain forest.