I plan to plop my coop in a wooded corner of my yard. There isn't much grass on the ground, but plenty of leaves and pine needles weeds and dirt. The soil is sandy so it drains well - isn't too wet. Will my chickens be happy to scratch around in this environment or do they NEED to have grass all of the time. They will be able to free range on the grassy lawn for a small part of each day.