Hi, My local feed store has a run full of chicks(at least a hundred) from 2days old to 2wks old. It's a complete mix and strait run leftovers from chick breeder/farm no-sales, Store owner has no idea what breeds he got, is no help.. Probably at least six different breeds in run and there only $1.50, I only want hens, is there any breeds easy to tell or anything I could look for in this run?