House fly
yellow to red, to brown, to black as the pupa ages. New adult flies will emerge as early as two days after pupation (at temperatures above 30°C) or over [...] matter, such as food waste, carrion or feces, over the course of three to four days. Development time for all Musca domestica life stages is temperature-dependent [...] temperatures (around 15°C). Adult flies have an average life span of 15–25 days, but can live up to two months in the right conditions.