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Thread: Eurasian Wigeon moult schedule

  1. #1
    Senior Member
    Join Date
    Jul 2011

    Default Eurasian Wigeon moult schedule

    HI ALL:
    Yesterday here on Bainbridge Island, WA USA I observed a male Eurasian Wigeon that was either a moulting 1st year bird or an adult bird moulting out of eclipse plumage. Does anyone know about the moult schedule of this species and could tell me which scenario seems more likely at this time of year?

    Ian Paulsen

  2. #2
    Senior Member
    Join Date
    May 2009


    Adult Post-breeding
    Complete; flight-feathers simultaneous. Head, underparts, upper mantle, and scapulars first, late May to July in ♂ and unsuccessful nesting ♀, followed by wing between late June and early September. Back, rump, and tail prolonged; start before wing, finish later. Successful ♀ similar, but later: body July to early September; wing between late July and September, sometimes October. In both sexes, but especially ♀, part of back, rump, and tail moulted only once a year.

    Post-juvenile and First Pre-breeding Male
    Both partial. Limited amount of juvenile plumage changed for 1st immature non-breeding September–October. Mainly restricted to head, flanks, scapulars, chest, and sides of breast; usually replaced by breeding plumage before December. Breeding plumage appears from October (sometimes September); sides of rump, chest, flanks, and scapulars first, soon followed by head and rest of body. Marked variation in amount of breeding plumage acquired in autumn. Some in breeding by November–December, except back, rump, or some feathers on underparts; others mainly juvenile until spring, and at least back and rump until summer. Juvenile tail-feathers changed for breeding October–May (central pair first); some outer often not until July–August. Occasionally breeding tertials and some upper wing-coverts acquired from September, but often not before spring.

  3. #3
    Junior Member
    Join Date
    Jan 2008


    Both adult males and juvenile males are moulting at this time of year but, as a general rule, the young males are less advanced than the adult males. They are easy to age at this time of year as the adult males show their large white fore-wing patches, whereas the young males don't acquire them until their second winter.

  4. #4
    Senior Member
    Join Date
    Jul 2011


    What's the source of this material?

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