Albert de Jong
Larus cachinnans 6CY & 10CY female 17P1 May 05 2005 & April 30 2009, Włocławek Reservoir, central Poland. Picture: Magdalena Zagalska-Neubauer.
Female 17P1 in 6CY and 10CY; ringed as chick in 2000 within the core range in southern Poland. Note near thayeri-pattern on P10. Top May 05 2005, bottom April 30 2009, Wloclawek - Vistula river, Poland. Bird to show variation of wing-tip of adult Caspian Gulls at the mixed colony at Włocławek Reservoir, central Poland. Birds are included only if all characters are within known cachinnans variation, to ensure that influence of argentatus (possible hybrids etc.) is minimal or lacking. All birds were trapped at nests during incubation. If there are photos of the same bird from different years, they are presented side by side.
above: 6CY female 718P May 05 2005, Włocławek Reservoir, central Poland. Picture: Magdalena Zagalska-Neubauer.
below: 9CY female 718P April 30 2009, Włocławek Reservoir, central Poland. Picture: Magdalena Zagalska-Neubauer.
Below, table 1 is repeated to score this bird. Not all traits can be scored, the partial scores are in italic + bold.
Here, only 5 traits are visible from the image, score so far is 4, with theoretically another 10 points possible.