Larus cachinnans

(last update: February 16, 2013)

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

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cachinnans plumages

Larus cachinnans x argentatus hybrid adult female S.S May 21-25 2013, Amerongen sluizen complex, The Netherlands. Picture: PieterGeert Gelderblom;
and below: Larus michahellis adult male J.N May 21 2013, Amerongen sluizen complex, The Netherlands. Picture: PieterGeert Gelderblom.

Female cachinnans x argentatus hybrid adult, ringed previous XKAC. Green XKAC ringed female pullus June 10 2003 at Sedlitzer See, Germany (5133.00N 1417.00E). Autumn 2008 & 2010 & 2012 bird recorded at Waddensea the Netherlands.

Orange-yellow orbital ring and gape. Yellowish pink legs. Strong bill with obvious gonys angle. Much speckling in iris. Broken band on P5, large mirrors on P9 and P10.

Measurements:
HB 123.7
BILL1 64.1
BILL2 53.2
BILL3 22.8
BILLD 20.5
G1 18.9
G2 18.5
G3 42.3
LML 78.6
Greyscale wing 5.0
Greyscale rump 6.5
Tarsus long 81.5
Tarsus short 70.0
Middletoe 68.6
Wing 439
W10 59
B10 39 (59)
Leg colour 3
Iris speckling 3
Eye ring 2.5
Gape 2.0

Measurements indicate this female Blue SS is probably a Caspian x Herring Gull. Below are some pictures of her partner, a very large male Yellow-legged Gull michahellis, now in 2013 ringed at the nest tibia blue JN. Ringed by Roland-Jan Buijs, measurements again by Jeroen Nagtegaal, and images by PieterGeert Gelderblom.

Measurements:
Head+Bill = 128.0
BILL1 = 67.2
BILL2 = 58.7
BILL3 = 21.9
BILLD = 21.8
G1 = 20.0
G2 = 21.1
G3 = 43.8
LML = 83.4
Greyscale wing = 7.0
Greyscale rump = 7.5
Tarsus long = 83.5
Tarsus short = 72.6
Middle toe = 74.5
Wing = 471
W10 = 74
B10 = 162
Clour leg = 5
Iris 3
Orbital ring = 4.0
Gape = 3.0