As others have posted the bot flies, they are quite visable in woodchucks, rabbits, and raccoons on Long Island. The small game season starts on Nov. !st, this is the latest start for NY state as a whole. The idea is the first frost supposedly is needed for the flies-larvae to vanish. They appear to run a time schedule rather than a temperature. In early June the flies are a indicator of an active woodchuck hole, some of the farms offer a bounty to the workers for woodchucks and rabbits. In October they are usually gone from the meat of the rabbits way before any frost. The workers don't eat them while the worms are present, while a European farmer soaks the meat in vinager with no hesitation..