IJmuiden Project - Fred Cottaar, José Verbeek, Maarten van Kleinwee & Mars Muusse

(last update: January 01, 2023)

Lesser Black-backed Gull (graellsii) PB sub-adult, May 16 2006, Moerdijk, the Netherlands. Picture: Mars Muusse.

Ringed as breeding 5CY or sub-adult on May 16 2006 at at Tetrapak Moerdijk, by Roland-Jan Buijs.

Wing 430 mm.
Grey tone 10.
P10: full sub-terminal band; mirror on both webs.
Division on P10: Sharp division between grey and black on underwing.
P9: mirror only on one web.
P5: complete band.
Black on 7 primaries.
Black on primary coverts: yes, which is black has to exceed shaft streak (only black on shaft is 0)
No red on upper mandible.
Black on upper and lower mandible.
Orbital ring is red.
PMS = 0.
Date = May 16 2006.

below: Lesser Black-backed Gull (graellsii) PB 5CY-type, May 16 2006, Moerdijk, the Netherlands. Picture: Mars Muusse.