Overview
for House Fly
The house fly is the plain gray fly around kitchens, garbage cans, barns, and picnics almost anywhere people live. It is found across the globe, breeding wherever food and waste leave it somewhere damp and rotting. Source: https://entnemdept.ufl.edu/projex/gallery/dl/Beneficial_Arthropods_Parasitoids/TEXT/DIP_House_fly_Musca_domestica.html
It doesn't bite, but it grows up in filth and then strolls across your sandwich like a guest who never wipes its feet. Source: https://extension.psu.edu/house-flies