Carrion-colonizer
Guides
Fannia pusio
Chicken Dung Fly
Fannia pusio is a small calyptrate fly in the family Fanniidae, commonly known as the chicken dung fly. Native to Central and North America, it has achieved near-global distribution through human-mediated dispersal associated with livestock. The species is notable for its synanthropic association with poultry facilities, where it can reach nuisance-level populations. It has forensic significance as a colonizer of decomposing remains, including buried corpses inaccessible to larger flies, and serves as a developmental indicator for post-mortem interval estimation. Females also function as phoretic hosts for Dermatobia hominis eggs, linking the species to veterinary and medical myiasis cases.