Gull 2cy (argentatus), August
A rather typical 2cy argentatus from
Finland with broad bars on the wing-coverts and lower scapulars. The complete moult is almost
most wing-coverts and the inner primaries moulted to second generation.
The outermost primary P10 is still juvenile in one wing and P1-P7 are fully
grown second generation flight-feathers. The innermost secondaries are
still juvenile. Most tail-feathers are second generation now, with the
outer rectrices still growing.
The tertials and most of the wing-coverts are replaced for second
generation feathers. The last moulted wing-coverts are the outer
lesser coverts and the central greater coverts. These feathers have a warm
hue on the pale parts. All juvenile scapulars have been
replaced for second generation feathers, including the scapulars in the
lowest row. The upper scapulars and mantle were replaced long ago and
the old second generation feathers look
abraded. A few new third generation scapulars are moulted in in
the lower upper scapular row. Those feathers show a warm buffish tone on
the centres and a neat fringe. A few lower upper scapulars are missing.
By August, the warm brown tones of the first moulted
wing-coverts (upper tertials, inner greater coverts and median coverts) are faded to
plain white, leaving a contrasting barred pattern on the wing-coverts. On
average, 2cy argentatus is more contrastingly patterned than same
aged 2cy argenteus, especially regarding the pattern on the inner
greater coverts and the white belly and flanks. However, some argentatus are distinct "washed
out" brown or show the common vermiculated pattern of 2cy argenteus.
last moulted coverts are the central greater coverts and outer lesser coverts, replaced by
mid-August. From mid-August onwards, 2cy argentatus start the partial autumn
moult, starting again to drop the upper tertial and inner greater and
In the table below, the primary moult
scores of 2cy August argentatus in Finland can be read:
in August, Tampere landfill, Finland, August 10 2002, 10:00-12:00 h.
primaries: m = 9.3, SD = 0.69, n = 139.
new primaries: m = 6.9, SD = 0.47, n = 139.