3cy+ April (female), showing variation. Note that innermost S was not included in the complete moult (=retained/forgotten feather) and by now is more than 1,5 years old. If this feather could be specified to generation (juvenile vs post-breeding) the age of the bird could theoretically be set to 3cy or 4cy+. However, the wear of a feather is affected by many different factors, and such specification is generally risky. [1ET29458]