This male
cachinnans, with metal clip-ring and paired to female Herring Gull tibia white 7C is not the only
cachinnans (hybrid?) breeding at Amerongen sluizencomplex in 2013. This year, a very large female with green ring XKAC also has a nest with 3 eggs, paired with a monsterous male
michahellis. Both male
michahellis and female
cachinnans (hybrid?) have been ringed in 2013. Here some data, which can be used to compare to 'true
cachinnans' from Poland and Ukraine.
Measurements taken as in Polish colonies, by Greg. Neubauer (images below are his).
![Waterbirds_31(211-219)micha-3.jpg](./download/file.php?id=4169&sid=6d54057dae8d6d4bfaaf3e89c511f924)
- Waterbirds_31(211-219)micha-3.jpg (161.26KiB)Viewed 5833 times
![Gull measurements_ver2-2.jpg](./download/file.php?id=4170&sid=6d54057dae8d6d4bfaaf3e89c511f924)
- Gull measurements_ver2-2.jpg (363.96KiB)Viewed 5833 times
![Gull measurements_ver2-3.jpg](./download/file.php?id=4171&sid=6d54057dae8d6d4bfaaf3e89c511f924)
- Gull measurements_ver2-3.jpg (287.39KiB)Viewed 5833 times
Female
cachinnans (hybrid?) green XKAC, now new ring tibia blue SS
Measurements (by Jeroen Nagtegaal / Roland-Jan Buijs / PieterGeert Gelderblom)
Head + Bill = 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
Attached images of tibia blue SS (formerly green 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.
Below, attached images of trapped bird at the nest. Pictures by PieterGeert Gelderblom.