Larus cachinnans

(last update: February 16, 2013)

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

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cachinnans plumages

Larus cachinnans 1CY-2CY PLG DN-28100 August 2012 - April 2013, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.

Metal ring from Poland, PLG DN-28100, cachinnans ringed as pullus on May 10 2012 by Marcin Sidelnik, in Wyspa na Wisle, Kepa Nadbrzeska (= Island in the Vistula River, Kepa Nadbrzeska), near Warschau, Poland (52°01' N, 21°13' E). This colony holds a mixed population, with cachinnans dominating and argentatus, michahellis and even single fuscus breeding as well. Details on the composition of these breeding colonies, see LOCATIONS and RESULTS and ORIGIN & MIGRATION.

Recoveries:
DN 28100 10-5-2012 Wyspa na Wisle, Kepa Nadbrzeska cach colony pull 52°01'00"  21°13'00"
DN 28100 21-8-2012 Deponie Pohlsche Heide Steppenmöwe 1cy 52°23'04"  08°46'53"
DN 28100 28-8-2012 Deponie Pohlsche Heide Steppenmöwe 1cy 52°23'04"  08°46'53"
DN 28100 25-4-2013 Deponie Pohlsche Heide 2cy 52°23'04"  08°46'53"

below: cachinnans 1CY PLG DN-28100 August 21 2012, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.

Several scaps replaced; no coverts and no tertials replaced.

below: cachinnans 1CY PLG DN-28100 August 28 2012, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.

Bird recalls Herring Gull argentatus, by head shape, bill shape and by notched pattern on lower scaps, inner GC and tertial fringes.

below: with green ringed German 1CY argentatus. Now starting to drop innermost GC and MC in post-juvenile moult.

below: cachinnans 2CY PLG DN-28100 April 25 2013, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.

By spring, hard to be certain about the exact post-juvenile moult as all feathers look very worn and bleached. One central tail feather replaced. Note short, stocky legs and lack of ventral bulge.