These adult and sub-adult Atlantic
Yellow-legged Gulls (Larus michahellis atlantis) were
photographed by Pep Arcos in Portugal (see captions for locations and dates):
AYLGU on left, LBBG on right:- note that the LBBG is more advanced in its molt (P7 longest; no old Ps) than the AYLGU (P7 longest; old P9 and P10 still present):
