Boy or girl?

I wish I knew the sex of these awesome chickens. Can anyone help?

they are too old to tell what sex they are, to determine what sex they are you need to look at their wings when they are only chicks and if they are pointed then they are most likely a male if they are rounded then they are most likely female but older you just have to wait and listen if they crow

I thought one could tell by the shape of tail? Up and over, a boy. Just up or straight out, a girl. Am i wrong? Thanks.