Green bottle flies, Lucilia sericata, lay eggs and dead animals. These flies are often the first decomposer to arrive on a carcass. The fly larvae are important ecosystem decomposers that consume the carcass.
Blow flies only fly when there is sufficient light. Where do they spend the night? Adult blow flies feed on nectar from a variety of flowers including mint. This group of blow flies was photographed on mint just before dark. Roosting next to a nectar source allows the flies to get a nectar energy drink in the morning before flying off for the day.