2cy (argentatus), August
A 2cy argentatus, trapped and ringed as 2cy bird orange
C527R, today August 11 2002 in Tampere Finland (61.31N,23.43E). A bird with a dark iris and arm-span of 440
The complete moult is well underway with
most wing-coverts and the inner primaries moulted to second generation.
The outermost primary P10 is still juvenile. P1-P7 are fully
grown second generation flight-feathers and P8 is already reaching at the
length of P6. The primary moult score is 41. The outer secondaries are
replaced for second generation feathers: S1-S11 are new, from S12 inwards
a small group of secondaries is missing and a few innermost secondaries
are still juvenile.
The tertials and most of the wing-coverts are replaced for second
generation feathers. The only wing-covert still to be replaced are the
lesser coverts, of which feathers are still missing in the carpal edge. All scapulars have been
replaced by second generation feathers, including the scapulars in the
By August, the warm brown tones of the first moulted
wing-coverts (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 central
greater coverts. However, some argentatus are distinct "washed
out" brown, showing 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.