Treats for Chickens Worms and Harvest Flakes are full of nutrient rich proteins and tasty fresh grains. Worms and Harvest Flakes are a healthy combination of organic flaked grains and mealworms, rolled oats, flaked wheat, flaked rye, flaked barley, flaked kamut, flaked spelt and dried mealworms. Hand feed or toss on the ground and listen to the flock talk.