Larus cachinnans

(last update: February 16, 2013)

Coordinator:
Peter Adriaens (Belgium)
Ies Meulmeester (Netherlands)

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cachinnans plumages

Larus cachinnans 1CY FF December 24 2011 2011, Leiden, the Netherlands. Picture: Maarten van Kleinwee.

Tibia yellow FF and metal Arnhem 5463250.

Some of the identification features of a first-calendar year Caspian Gull, distinguishing it from a European Herring Gull or a Yellow-legged Gull of the same age include:

  • Thin high legs, showing much tibia (upper leg)
  • Light-grey scapulars with distinctive dark anchor
  • Moult in the wing coverts
  • White head with light streaking and lack of an eye patch as for Yellow-legged
  • Large black bill, somewhat parallel and no blunt tip
  • Inner primaries with light inner web and dark outer web (creating a ‘Venetian blind’ effect)
  • Small white tips to the inner primaries (apical spots)
  • Narrow banding on the tail above the subterminal band