Larus cachinnans

(last update: February 16, 2013)

Coordinator:
Peter Adriaens (Belgium)
Ies Meulmeester (Netherlands)

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cachinnans plumages

Larus cachinnans 1P34 adult, May 2013, Wytyckie Lake & April 2014, Zastów Karczmiski, Poland. Picture: Łukasz Bednarz ringing team.

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For 2012, breeding location of 150 pairs cachinnans, of which 54 adults ringed and 158 pulli in 2012 (pers comm. Łukasz Bednarz).

below: Larus cachinnans 1P34 adult, May 15 2013, Wytyckie Lake - Urszulin, Poland. Picture: Łukasz Bednarz ringing team.

Breeding bird trapped at the nest. Adult, with dense speckling in iris. Red orbital ring and gape. No red on upper mandible; black on the upper and faint black on the lower mandible. Pink legs.
Deep white tongue on P10 (breaking the medial band, so merged with white tip = thayeri pattern, also on P9), and broken black band on P5; no black spot on P4. P1-P2 dropped; PMS=2.

below: Larus cachinnans 1P34 adult, April 11 2014, Zastów Karczmiski, Poland. Picture: Łukasz Bednarz ringing team.

Excellent find in the Zastów Karczmiski colony. Birds like this one illustrate there is some migration between these two colonies, which may help explain why taxa other than cachinnans (i.e. argentatus and michahellis) are found in the Wytyckie Lake if the migration works two ways (v.v.).