I've feather sexed chicks before, so I know how it works. I want to know: if you don't know that a chick you want to buy is feather-sexable, but it's following the rules of feather sexing (ie the wing feathers are different lengths on one bird and the same length on another bird) does that mean you can feather sex them? Or are there strains that have slow-feather-growing females and fast-feather-growing males?