I have a 6 week old salmon favorelle cockarel that only has feathers on it's chest, wings and legs. Still has fuzz all over his backside. All the other chicks, younger than him including his sister that has moved to another home have all feathered out.. Whats up? He was also the chick that I was worried about when I first got him he slept all the time and was really weak I had to hand feed him until he started getting stronger. Any insights anyone?? Thanks bunches !