Black-headed Gull Chroicocephalus ridibundus
BHG adult January
Black-headed Gull - Black spots
Below is an overview of individuals showing black spots on wing feathers.
Below: Second-calendar year Black-headed Gull, December 3, 2010, Zoetermeerseplas, Zoetermeer, The Netherlands (52.088N, 4.506E). Photo: Maarten van Kleinwee.
Second-calendar year Black-headed Gull with distinctive black spots on the tertials. Out of the 266 Black-headed gulls caught and ringed that day, two individuals showed these types of markings.
Below: Black-headed Gull E8YX with black spots on the alula and the primary coverts of P6 and P8. Note also the distinct black mark on the outer web of P9.
Ring info: metal ring added January 8, 2010, color ring added December 3, 2010, Zoetermeer, The Netherlands. Age: 2nd calendar year.
Below: Second-calendar year Black-headed Gull V-S, November 29, 2012, Musis Sacrumpark, Arnhem, The Netherlands (12.981N, 5.915E). Photos: Jeroen Nagtegaal.
Second-calendar year female with extensive dark markings on alula, primary coverts and outer secondaries. The tips of the tertials (not visible in the images) were also reported to be distinctly white.
Below: Adult Black-headed Gull, December 30, 2012, Leiden, The Netherlands (52.169N, 4.496E). Photo: Maarten van Kleinwee.
Individual with black spots on the alula.