This is an excellent image from which to assess the age of this bird. The two innermost greater coverts have been replaced in the post-juvenile moult, and are longer than the rest of the greater coverts, which also show more obvious pale tips. Thus this bird hatched this year.
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This is an excellent image from which to assess the age of this bird. The two innermost greater coverts have been replaced in the post-juvenile moult, and are longer than the rest of the greater coverts, which also show more obvious pale tips. Thus this bird hatched this year.
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