Hi, my neighbor has 2 RIR's and 6 Americaunas that are about 3 weeks old. All of the chicks are the same size and growing well-except one of the Americaunas. It looks like the size of a 4 day old...it isn't sickly looking, eating and drinking well, and even pecks at the other chicks-dominates the food by standing on top of the feeder and pushing the bigs ones away, funny. But we're wondering, why isn't it growing? They all seem healthy and completely fine. All the Americaunas were bought at the same time, same place as mine, and all were supposed to be Amer...so the only thing I could think of is maybe its a bantam that got mixed in or a mixed breed? What do you think?