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-27948 September 2011 - November 2012, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.

Metal ring from Poland, PLG DN-27948, cachinnans ringed as pullus on May 27 2011 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.

DN-27948 spend much of its 2CY on Deponie Pohlsche Heide, which allows to follow the moult progress in this individual bird. Great photographic documentation by Armin Deutsch!

Recoveries:
DN 27948 27-5-2011 Wyspa na Wisle, Kepa Nadbrzeska Steppenmöwe pull 52°01'00"  21°13'00"
DN 27948 28-9-2011 Deponie Pohlsche Heide Steppenmöwe 1cy 52°23'04"  08°46'53"
DN 27948 13-10-2011 Deponie Pohlsche Heide Steppenmöwe 1cy 52°23'04"  08°46'53"
DN 27948 20-10-2011 Deponie Pohlsche Heide Steppenmöwe 1cy 52°23'04"  08°46'53"
DN 27948 28-10-2011 Deponie Pohlsche Heide Steppenmöwe 1cy 52°23'04"  08°46'53"
DN 27948 14-6-2012 Deponie Pohlsche Heide Steppenmöwe 2cy 52°23'04"  08°46'53"
DN 27948 18-6-2012 Deponie Pohlsche Heide Steppenmöwe 2cy 52°23'04"  08°46'53"
DN 27948 22-6-2012 Deponie Pohlsche Heide Steppenmöwe 2cy 52°23'04"  08°46'53"
DN 27948 29-6-2012 Deponie Pohlsche Heide Steppenmöwe 2cy 52°23'04"  08°46'53"
DN 27948 5-7-2012 Deponie Pohlsche Heide Steppenmöwe 2cy 52°23'04"  08°46'53"
DN 27948 2-8-2012 Deponie Pohlsche Heide Steppenmöwe 2cy 52°23'04"  08°46'53"
DN 27948 9-8-2012 Deponie Pohlsche Heide Steppenmöwe 2cy 52°23'04"  08°46'53"
DN 27948 28-11-2012 Deponie Pohlsche Heide Steppenmöwe 2cy 52°23'04"  08°46'53"

Classic bird, although venetian blind effect on innerwebs of inner primaries not very conspicious. Left wing: no coverts and no tertials included in post-juvenile moult; right wing single feathers replaced.

below: cachinnans 1CY PLG DN-27948 September 28 2011, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.

Two 1CY cachinnans, with 1CY argentatus in centre.

1CY cachinnans, with 2CY michahellis (right).

below: some 1CY cachinnans have very simple patterned, grey 2nd gen scaps.

below: cachinnans 1CY PLG DN-27948 October 28 2011, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.

Like other gull species, cachinnans may put much energy in defending food against rivals. But look at this smart corvide.

below: no coverts and no tertials included in post-juvenile moult.

below: cachinnans 2CY PLG DN-27948 June 14 2012, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.

Complete moult started: P3/P7, P4 almost equal to P3. By this stage, most MC and inner LLC are replaced as well. Upper TT replaced as well. Central GC dropped, exposing secondary bases lying underneath.

below: cachinnans 2CY PLG DN-27948 June 18 2012, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.

Complete moult: P4/P7, P4 over P3. New central GC quickly growing in. Tail and secondaries completely old juvenile.

below: cachinnans 2CY PLG DN-27948 June 29 2012, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.

Complete moult: P4/P8, P5 almost equals P4. Moult wave in central GC progresses inwards. Now almost all LLC dropped. Tail and secondaries completely old juvenile.

below: cachinnans 2CY PLG DN-27948 July 05 2012, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.

Complete moult: P5/P8. Central tail feathers now dropped. In central GC the two moult waves almost meet. Last juvenile coverts are found in carpal edge. probably S1 (outermost secondary) also dropped at this stage.

below: cachinnans 2CY PLG DN-27948 August 02 2012, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.

Complete moult: P7/-. New tail feathers growing. Gap in central GC closed. Still coverts moult in carpal edge. Large moult gap in secondaries. Lower tertials still juvenile.

below: cachinnans 2CY PLG DN-27948 August 09 2012, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.

Complete moult: P8/-. New tail. Lower tertials now dropped.

below: cachinnans 2CY PLG DN-27948 November 28 2012, Deponie Pohlsche Heide - Minden, Germany (52°23'05N, 08°46'45E). Picture: Armin Deutsch.

Complete moult finished, note mirror on P10 common in cachinnans. Compare the picture below to the picture above (August 09 2012) to better understand the extent of the partial autumn moult. For another time, coverts ahev been replaced in September-October, and by November the wing coverts look different from August in several ways.

TT1-3 have been replaced again. GC1-3 have been replaced again. MC1-11 (MC11 last visible) replaced, LLC1-2, 4 replaced as well.