Because its nearly free, mine get husked corn. Other than that they get BOSS, watermelon, lettuce/salad mix they share with the rabbit, grass clippings, leftover worms from fishing, rice krispies, brown rice, sometimes a few hard boiled eggs (left over from easter), sliced carrots, peppers, I dont give then any meat (only makes sense to me) they dont like bird seed, they like cracked corn and uncooked oatmeal.
If their still hungry, they'll poke around the feeder for some layer feed.