Hatched out some dark cornish. Thought I'd keep a few. Given they change as they grow and then change again and again likely, could someone experienced tell me what to look for to pick the best ones? Such as squatty looking body? Shorter legs? Wide heart shaped back? Head? I thought too, that if I picked each one up and if they were all the same size but one felt 'beefier', that too could be a good clue! Any advice? Would it help if I posted pictures?