Larus cachinnans

(last update: February 16, 2013)

Home

cachinnans PDF

cachinnans in Poland

cachinnans in Holland

cachinnans rings

cachinnans plumages

1cy August
1cy September
1cy October
1cy November
1cy December

2cy January
2cy February
2cy March
2cy April
2cy May
2cy June
2cy July
2cy August
2cy September
2cy October
2cy November
2cy December

3cy January
3cy February
3cy March
3cy April
3cy May
3cy June
3cy July
3cy August
3cy September
3cy October
3cy November
3cy December

sub-adult January
sub-adult February
sub-adult March
sub-adult April
sub-adult May
sub-adult June
sub-adult July
sub-adult August
sub-adult September
sub-adult October
sub-adult November
sub-adult December

adult January
adult February
adult March
adult April
adult May
adult June
adult July
adult August
adult September
adult October
adult November
adult December

Larus cachinnans hybrid? 4CY 6P27 May 17 2007, Łubna landfill, Poland. Picture: Ruud Altenburg.

Green 6P27. Ringed as a pullus on May 13 2004 in the mixed colony of Wisla reservoir - Wloclawek, Poland (52°39'N, 19°08'E).

This bird is a good example of the problem ageing sub-adult Caspian Gulls. There is a large proportion of 'immature' wing coverts and a white mirror on P10 seems to be absent altogether. Still green 6P27 is 4cy, ringed as pullus at Włocławek, known for its mixed breeding population (pulli registered as "Larus argentatus-complex"). The presence of so many immature patterned wing-coverts and tertials may be an indication for argentatus geneflow - normally Caspian Gull develop a mature plumage earlier that Herring Gulls do.