Monday, 31 December 2007

Caspian Gull (Larus cachinnans), ad, 30.12.2007, Lakolk Strand, Rømø (#1)

This is the first of today’s five different Caspian Gulls at Lakolk on Rømø where four were photo documented and the other three to be seen here, here and here.

Characters in favor of cachinnans are the relative long thin bill without pronounced gonys angle, the black spot above the red gonys area, the relative small and dark eye in a pure snowy white head, the slightly darker upperparts than on nearby argentatus and the good cachinnans jizz with a high push up breast, small head, flat back and slender elongated rear with long primary projection. Additionally the small white apical spots are good for cachinnans as is the all white tip of p10.

Seen on location but without documentation was pale yellowish and relative long thin legs (seen when the bird was standing), broad black band on p5 and classic grey tongues on outer primaries surrounded by a black cachinnans boomerang (created by the black primary markings seen from underneath when flying off).

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