I'm a first time turkey rancher, and i'm trying to figure out if i have boys or girls . One of the birds has a redder neck and head than the other three (bottom middle i think). Is this a good indicator? They are about 10 weeks in this picture. I thought they would look bigger by now, but all in good time I guess? How much feed should they eat per day? I feed them 15% grower and they also have free range of the yard (and patio and pool - one fell in). None have shown much interest in scratch or table scraps like the chickens. Weird? Any fattening up ideas?