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Message: <blockquote data-quote="P.Sunesen" data-source="post: 3320499" data-attributes="member: 100020">According to the available books such as Dick Forsman's guide, female Hen Harrier will be in adult plumage when finishing its first complete moult during summer/autumn in its second calendar year.I don't personally have enough experience with museum skins or have spent enough hours in the field to tell the age here. But adult is good enough for me<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" />I don't at all dispute Tib's suggestion/assertion that the OP bird is in its first adult plumage, but 'tecnically' its just as much an adult as a first adult Peregrine, Common Buzzard or Goshawk.Species that are normally not seen well enough in the field to tell whether they are in their second- or in their seventeenth year, provided the moult is finished or almost finished.Peter</blockquote>