Every year for about 45 days my land supports a massive hatch of May Beetles and Crane Flies. This represents a lot of low cost protein. Typically, in the evening, juvenile chickens that make most use of this bounty engage in "hawking" where they spread out in pasture / yard and catch insects as they emerge or fly through the chickens' field of view. In the 30 minutes or so it occurs each night it is easy for most birds to get a good crop fill in nothing but protein and fat rich insects. Currently all of my chicks and juveniles are penned during this time. Going to make adjustments to get those young birds in contact with the hatch.