Or do they need some food thrown at them every day? We have typical Arkansas / East Texas grass/weeds, about 1 1/2 acres. We currently have 9 full-grown chickens and 4 chicks, but will be acquiring chicks and eventually plan to raise more chicks from our fertile eggs. Would a flock of 30 or so survive on an acre and a half of grass/weeds and the bugs they find? How would I be able to tell if chickens aren't getting enough to eat? Their feathers make it hard to tell if they're skinny!