Larus cachinnans

(last update: February 16, 2013)

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cachinnans in Poland

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cachinnans plumages

1cy August
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2cy January
2cy February
2cy March
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2cy May
2cy June
2cy July
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2cy October
2cy November
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3cy January
3cy February
3cy March
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3cy May
3cy June
3cy July
3cy August
3cy September
3cy October
3cy November
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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 4P27 adult, May 06 2014, Zastów Karczmiski, Poland. Picture: Łukasz Bednarz ringing team.

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Location: Zastów Karczmiski, Poland - colony at the banks of the Middle Vistula river.
In 2004 240 breeding pairs (95% cachinnans, <5% argentatus). (Ornis Fennica 2011 88, 80-89) and in 2012 592 pairs (90% cachinnans, <10% hybrid / argentatus) and possibly Larus michahellis (pers comm. Łukasz Bednarz).

Middle Vistule river is a location where several taxa breed: see composition. Since this is a mixed breeding population where hybridisation is not uncommon, the ringing centre in Poland decided to label birds "Larus argentatus sensu lato". Still bulk of the breeding birds in Middle Vistula region show features of cachinnans.

Breeding bird trapped at the nest. Adult, with dense speckling in iris. Red orbital ring and gape. No red on upper mandible; no black on the upper and some black on the lower mandible. Pale yellow legs.
Deep white tongue on P10, full black band on P5; no black spot on P4. P1 growing, P2 dropped, PMS=4.