Male, 1cy, October. Males show on average more, and brighter, yellow and less black in the tail (including juvenile RR as shown here). According to Bayley & Boothby (2015) the length of black (measured on R5, along the shaft, from the tip to the proximal point where the black colour stops in the vane) is <27 mm in males and >30 mm in females (birds with 27-30 mm black should be lef unsexed). Note that the given measurments applies to juvenile RR only. [CV54723]