I'm sure Doug or Burt will be along to give you a better answer but even the head and posture of the 2 look like a cock and hen to me. Have you seen one of them displaying? My yearling BS displays his little train all the time.
I know the one on the left is a male the other look like it could be a hen but if you have not pull the tail feather out I could tell you for sure if it a male or hen.