Final answer:
Green and blue bottle flies are commonly found near dead animals and rotting carcasses due to the putrid odor of decomposing organic matter, which attracts them.
Step-by-step explanation:
Green and blue bottle flies, known for their shiny, metallic appearance, are usually found near dead animals and rotting carcasses. These flies are attracted to the putrid odor produced by polyamines like putrescine and cadaverine, which are emitted during the decomposition of animal proteins.
This is why you will frequently observe these flies around areas where there is decaying organic matter such as dead animals and not generally in places like open drains or clogged drains, unless those locations contain decomposing organic waste.
Forensic entomologists can use the presence of these flies and the states of their maggots to estimate the time of death in cadavers, showcasing the importance of understanding their habitat and behaviors.