2cy (argentatus), August 06 2002,
A 2cy argentatus, ringed in
Finland: white C7J68. The complete moult in summer is well underway with
most wing-coverts and the inner primaries moulted to second generation.
Primary P8 has been dropped and P9 is still juvenile. P1-P5 are fully
grown second generation flight-feathers. As can be seen in the image, the
inner secondaries are still juvenile and very abraded and bleached.
The upper tertials and the median coverts are replaced for second
generation feathers. Most of the lower lesser coverts and greater coverts
are replaced as well, with the central greater coverts still growing: the
gap in the greater covert row is almost closed. In the carpal edge (the
outer lesser coverts) most feathers are still juvenile, these feathers can
be recognized by the washed brown centres. Almost all scapulars have been
replaced by second generation feathers, including the scapulars in the
lowest row. In the lower upper scapulars, a few feathers have been moulted
to third generation; they show a buffish brown base.
By August, the warm tones of the first moulted feathers
(inner greater coverts and inner median coverts) are faded to
plain white, leaving a contrasting barred pattern on the wing-coverts. The
last moulted coverts are the central greater coverts and outer lesser coverts, replaced by
mid-August. In some birds, the new greater coverts may show a vermiculated, densely barred
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.