I've felt his chest and can feel the keel bone fairly well but I'm not sure what else it should feel like. He's kinda beefy and I'm starting to wonder what it actually is. He eats his pellets and veggies like a pig and its always swinging around and playing like a madman. Recently he's been doing some short flights too so I don't think it's impossible for him to be muscular but he eats so much