Yellow-legged Gull - Geelpootmeeuw (L. michahellis): sub-ad August
(last update: 08 december 2003)
photo 7338: Yellow-legged Gull michahellis sub-adult, August 10 2003, Etaples, France (50.44N, 01.35E).
Two images of feeding michahellis at Etaples. Average moult stage of the primaries in full adult birds: P8-P10 still old, P4 fully grown and P5 at the length of P3. Average Primary Moult Score (PMS) of adults: about 28 by August 10. All rectrices and secondaries old and present in the vast majority of full adult birds, showing heavy wear in the tail-feather tips.
The bird left in the pictures show advanced
secondary and rectrices moult for michahellis. The outermost secondaries
are shed, so secondary moult started at the division of primaries and
secondaries. S1-S2 are just visible in the bottom image. Primary moult is
slightly advanced as well, as P1-P5 are already fully grown and P9-P10 left.