please help sex four birds, two are Marans, one is a Columbian Wyandotte, and one is a buff Orpington. all born on March 23, so almost three months. none are crowing. one maran looks like a roo, but I think (hope) the other is a hen. the Wyandotte has gorgeous iridescent tail feathers, while the other Wyandotte we have does not (no photo of that one). please help! thanks!