I've got these pullets who are about 15 weeks old (RIR and EE). While picking them up and handling them, I felt their keelbones and these birds aren't very plump. I mentally compared them to the Cornish game hens or fryers I've gotten from the store in the past, and it seems to me there isn't much muscle on the birds and no fat at all. Their legs are well muscled because they run around a lot, and they've feathered out well except one who was plucking herself a bit (the feathers are re-growing). They're bright-eyed, sociable, and they eat a lot. I feed them as much as they want of green leafy things, weeds, fruit (but not every day), seeds, corn, bread leftovers (but not every day), and pumpkin leaves that are crawling with bugs. They eat both the bugs and the leaves. Also they've eaten every ant in both hills that used to be in their run. Once in a while they get yogurt or other expired dairy. I've never seen their crops completely empty, and they eat until they're no longer interested in the food then come back periodically to graze, yet when I arrive at the pen they all re-enact Scarlett O'Hara's starvation scene from "Gone With The Wind". Are my chickens getting enough to eat or are they just being little drama queens? Are they supposed to be this skinny (that is, mostly feathers and not plump like grocery store chickens)?