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Lokalitet:
Allegany, Maryland - USA
2012-06-21
Fotograf: Frode Jacobsen - Se profil

Beskrivelse: Note striking molt limit in wings and coverts between retained juvenile brown feathers and new adult solid black feathers typical of a second-year male, compared with the recent Norway bird displaying a completed molt of remiges, retrices, and wing coverts most unusual for this age group.

Uploadet 2012-06-22 Publiceret 2012-06-22 Pheucticus ludovicianus Rose-breasted Grosbeak
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Kommentarer
Jan Jörgensen
23. jun. 2012 kl. 13:45
As noted by Frode the the norwegian bird sems to display a full set of adult primaries (if not the single juvenile prims or secondarie is hidden between the adult ones?), and primary covert. Whether the tail is all adult is difficult to se from the images, since some 2cy replace a few/half to all t-feathers in the preformative moult. Since this species is hugely variable regarding moult and appearance see herethe norwegian bird might possibly be an adult male which has failed to develope fully adult body feathers, perhaps due to being out of range. Might it be an advanced 2cy male with early replaced primaries and primary coverts?(a few 2cy males at this time of year has apparently renewed some outer primaries. adult & 2cy 2cy (SY) male in May 2cy (SY) male in Sept Notice in the last May bird here the blacker outer primaries. JanJ

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