Yellow-legged Gull - Larus michahellis

(last update: October 08 2013)

Delfín González
Gabriel Martín
Antonio Gutierrez
Amir Ben Dov
Mars Muusse

presumed hybrid Yellow-legged Gull michahellis x Lesser Black-backed Gull graellsii S.0 adult, March 31 2014, Maasvlakte, the Netherlands. Picture: Merijn Loeve.

Probably this hybrid. Obviously paler grey than local Lesser Black-backed Gull graellsii and with obvious gonys angle and more robust posture, like michahellis. Full broad band on P5, limited white in wingtip.
Still, clearly not pure michahellis, lacking the blueish cast over the upperparts, here more slate grey.