I got my first baby chicks from a hatchery two weeks ago. They all appeared to be about the same size when they arrived, but one of them has gotten enormous. It is literally 2.5 to 3 times bigger than any of the others--bigger feet, bigger head, everything--but it also looks "fat." It is supposed to be a California White and it looks like the other chicks, but huge. Any idea what's going on?