Do flies come from dead animals?
Considering this, do flies come from dead rats?
In most cases, flies from dead rats, rodents and birds emerge within a few weeks of maggot infestation. The maggots or fly larvae, mature faster in warm conditions and develop sluggishly in colder weather.
Secondly, why do flies go on dead animals?
The reason that flies lay their eggs in rotten meat is because it provides a food source as the larvae grow. When the eggs are laid in rotten meat, the maggots have all the food they need as they develop.
The first type of insect to arrive at a dead body is usually a blowfly (Calliphoridae), attracted by body fluids and gases. It lays its eggs within two days after death, so its stage of development - egg, larval stages, prepupal or pupal stage, adulthood - will suggest how long the corpse has been lying undetected.