AGE – BEST CRITERIA:
Autumn criterias are still applicable, though 2cy are more affected to wear during the winter than adult. Moult contrast present in the wing of 2cy, generally among central or outer GC, and in a few birds also in TT or RR. Adult birds show a uniform and freshly moulted plumage.
2cy April (male). GC1-5 juvenile, contrasting to post-juvenile GC6-10. Juvenile outer GC are worn and paler grey with narrow white tips while the less worn inner post-juvenile ones are darker greyish black, showing a wide rusty tip. [1ET29443]
2cy April (male). A bird that have renewed part of the tail in the post-juvenile moult. R1-3 in both sides are juvenile while R4-6 in both sides are post-juvenile, demonstrating the difference in shape between the two generations. [1ET29443]
3cy+ April. Uniformly post-breeding RR. Note that there is a variation in width and shape of the RR (this one being slightly more narrow and more pointed than most adult) and that some individuals are less straight forward in this respect. [1ET29416]
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]
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