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 argentatus sensu lato P407 adult, April 20 2012 & September 21 2012, Wytyckie Lake - Urszulin, Poland. Picture: Łukasz Bednarz ringing team.

For 2012, breeding location of 150 pairs cachinnans, of which 54 adults ringed and 158 pulli in 2012 (pers comm. Łukasz Bednarz). It is assumed that this population does not consist of pure cachinnans only; some hybridisation may occur, therefore the ringing centre in Poland decided to label difficult birds as "Larus argentatus sensu lato". Still bulk of the breeding birds in Wytyckie Lake show features of cachinnans.

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below: Larus argentatus sensu lato P407 adult, April 20 2012, Wytyckie Lake - Urszulin, Poland. Picture: Łukasz Bednarz ringing team.

Breeding bird trapped at the nest. Adult resembling argentatus in P10 pattern, gonys angle, pink legs, clean iris; but every character in itself may be within limits for pure cachinnans.
Limited speckling in iris (1-5%), almost clean iris. Orange-red orbital ring and gape. Red on upper mandible; black on the upper but no black on the lower mandible. Pink legs.
Deep white tongue on P10 ending gradually, not squarish, broad black band on P5; no black spot on P4. P1 still present, PMS=0.

below: Larus argentatus sensu lato P407 adult, September 21 2012, Wytyckie Lake - Urszulin, Poland. Picture: Łukasz Bednarz ringing team.

Head streaking more than average for most cachinnans, maybe pointing to hybrid genes.