A couple of my chickens have bare bellies. It doesn't look plucked, just smooth skin. Is this normal? They sleep on pine shavings. Could this be contributing? Also, I can clearly feel their breast bones when I pick them up. Is this normal? They get plenty to eat between feed, bugs and greens. Besides their free ranging, I feed them a local breeder mix, bake and feed their egg shells back to them, oyster shells and occasional veggie scraps. I can't imagine they're lacking in anything. My neighbors and friends chickens seem to be a little more plump. The Americana especially seems scrony.