It is able to reproduce very easily, both because of its ability to lay its eggs inside any decaying biological material, and because of the speed with which the larvae reach the adult state, becoming capable of reproduction in about ten days. During its life, which under optimal food and environmental conditions can vary from 2 to 4 weeks, it is able to lay up to 1000 eggs (500 at a time in groups of 150-200 each every 3-4 days). The adult insect uses a rasping proboscis to feed. Solid food is first sprinkled with saliva to be dissolved and then sucked up with the proboscis itself. Although they are domestic flies, generally confined to human dwellings, these insects can fly several kilometres from their place of birth. They are only active during daylight hours and at night rest in the corners of rooms or suspended from the ceiling. They are found where food is available, and an abundance of rubbish can harbour larvae.