Larus cachinnans

(last update: February 16, 2013)

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cachinnans in Poland

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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? 2CY 47P1 May 17 2007, Łubna landfill, Poland. Picture: Ruud Altenburg.

Green 47P1. Ringed as a pullus on May 18 2006 in the mixed colony of Wisla reservoir - Wloclawek, Poland (52°39'N, 19°08'E).

This bird is probable hybrid Caspian Gull L cachinnans x Herring Gull L argentatus, but parentage not known. Pictures show an intermediate bird between the two.
Plumage indicates Herring Gull L argentatus-roots, with much notching on tertials and wing-coverts. Note also the bold pattern on 2nd gen scapulars and angular head shape. In the field, it also showed traits of Caspian Gull, especially structure,with long exposed tibia, long winged appearance and weak gonydeal angle. Probably most important are the old, but still recognisable 2nd gen wing-coverts in the LC region. Bird ringed as pullus at Włocławek, known for its mixed breeding population (pulli registered as "Larus argentatus-complex"). Note the tail pattern, which seems closest to Greater Black-backed Gull L marinus!