Gulls to the Horizon
A blog about gull observations by a Dutch larophile
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Black-headed Gull
Chroicocephalus ridibundus
Reading ringed Lesser Black-backed Gulls in Morocco – January 2019
22CY Black-headed Gull White LYD – 20180128
Primary covert variation in 1st-winter Black-headed Gulls
Reading ringed gulls in Leiden – 20171204
Reading ringed gulls in Leiden and Katwijk – 20171117
Black-headed Gull White ECM9 displaying courtship and territorial behaviour – 20170304
Return of the Black-headed Gull with an extra ‘foot’ – 20161211
Celebrating my 200th ringed Black-headed Gull and 1600 sightings in Leiden
1CY Black-headed Gull with an extra ‘foot’ – 20151226
1CY Black-headed Gull White EFJ5 – 20150625
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