Yellow-legged Gull - Geelpootmeeuw (L. michahellis): 3cy August

(last update: 10 december 2003)


YLG 1cy May
YLG 1cy June
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YLG 2cy January
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YLG 3cy January
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YLG 3cy August
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YLG 3cy December

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YLG adult December

photo 7350: Yellow-legged Gull michahellis 3cy, August 09 2003, Etaples, France (50.42N, 1.34E).

An example of a delayed moulting individual, delayed in primary moult score compared to average 3cy michahellis.

Primary moult score of 3cy michahellis Yellow-legged Gull, at Etaples, NW France (50.43N, 01.37E) on August 11 2003.
. P5 fg P6 fg P7 fg P8 fg n:
P8-P10 5 - - - 5
P9-P10 3 24 - - 27
P10 old - 10 6 - 16
no old P - - 2 - 2
n: 8 34 8 - 50
n = 50; m new P = 6.0; SD new P = 0.57; m old P = 1.7; SD old P = 0.70.


In 3cy birds, the old second generation flight-feathers are replaced by new, more adult-like third generation feathers. This is most obvious in the (outer) primaries. The old second generation P10 is brown, abraded and will be replaced by glossy-black fresh third generation P10 showing an obvious mirror. The primary moult stage in this bird: P7-10 are old second generation and P4 is full-grown. The landing bird is a 3cy Lesser Black-backed Gull, showing a small gap in the primaries (not uncommon in LBBG), with P6 almost fully grown and P8-P10 still old second generation.