We have so many flies in the summer cause of all my animals. (not just 50+ chickens, but three goats, one horse, one mini donkey, and my gp dog). The flies are so thick and terrible. There are fly eating wasps that you can get and people swear by them. However that is horse people and I have never talked to anyone who also has chickens. They are a tiny wasp that lives in and mostly on the ground. They are more likely to crawl around than fly. They lay their eggs in fly pupa, when they hatch they then eat the fly larvae from the inside (parasite kind of thing). Here are my questions: since chickens eat bugs crawling on the ground and the flies are mostly crawlers would they eat up the wasps and have none left to kill off the flies? The wasps only live about 28-30 days and you have continually put out new wasp eggs monthly. I would hate to waist the money if they are only going to be eaten and not do any good to get rid of flies. Also, would they hurt the chickens when the chickens eat them? They are supposed to be very tiny things, but what if a chicken eats them?