Lesser Black-backed Gull (graellsii & intermedius)

(last update: 22-2-2011)

Lesser Black-backed Gull graellsii BLB L-100116 3CY, October 21 2004 Westkapelle, the Netherlands. Picture Pim Wolf.

A 3cy bird ringed in Belgium: Bruxelles L-100116. Ringed as pullus on July 06 2002 at Zeebrugge, Belgium.

From the continental "Dutch intergrade" colonies at the North Sea coast: medium grey upper-parts and the complete moult almost finished by late October.
Note the pattern on the upper tertials, which are more adult-like grey than the 4th tertial. The same holds for several coverts, especially the median coverts.