Northern Flicker

when i saw them they were displaying to each other in what i could only figure from watching all the BBC shows, was that they were two males arguing over something, they were both brightly colored and calling loudly while bobbing their heads side to side and almost mock fencing with their beaks but not coming within no more than 4 inches of each other. i could not see a female anywhere, but the two were equally colored so i figured they both were males. they're rather elusive and i've only been able to get these pictures ever, though i hear them calling frequently.