Several years back somebody did a legal experiment. They left a deer carcass in the middle of nowhere in the heat of summer when flies were active. It took about a week for the carcass to disappear, mostly from fly larva, often called maggots.
Some people feed their flock a treat called black soldier fly larva. You can buy the larva (google online) but some people make their own. They put dead meat up on a platform the chickens can't get to but in the run. The fly lays eggs that hatch in a few days. The larva feeds on the decaying...