Biology
for House Fly
House flies develop through complete metamorphosis: egg, larva (maggot), pupa, and adult. Eggs are white, banana-shaped, about 1.2 mm, and laid in clusters. Clutch counts vary by source: Penn State puts a female's total near 100 to 150, UF reports batches of 75 to 150, and Minnesota cites 75 to 100, so one female can lay a few hundred over her life. Source: https://entnemdept.ufl.edu/projex/gallery/dl/Beneficial_Arthropods_Parasitoids/TEXT/DIP_House_fly_Musca_domestica.html Source: https://extension.psu.edu/house-flies Source: https://extension.umn.edu/nuisance-insects/flies
The eggs hatch into pale, legless maggots that reach 7 to 12 mm, pass through three larval stages, and pupate in the hardened skin of the final stage. In summer heat the egg-to-adult cycle can finish in about 7 to 10 days, with a dozen generations in a season; adults usually live about two and a half weeks. Source: https://entnemdept.ufl.edu/projex/gallery/dl/Beneficial_Arthropods_Parasitoids/TEXT/DIP_House_fly_Musca_domestica.html Source: https://texasinsects.tamu.edu/house-fly/