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.
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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