I came across this rare occurrence of a sub-adult European Herring Gull with tertial spots this weekend.
Note the small black markings on the outer web of P5 and P4, as well as the staggered and sharply angled shape of the tongue on the underside of P10.
27 April 204, Maasvlakte, Rotterdam, the Netherlands.
It seems to be a 4th-calendar year (dark greater primary coverts) or 5th-calendar year (adult primaries) type.Sub-adult European Herring Gull with tertial spots
Regards,
Maarten van Kleinwee
The Netherlands
http://www.flickr.com/photos/little-w/
Blog: Gulls to the horizon
Twitter: @Argentatus
Maarten van Kleinwee
The Netherlands
http://www.flickr.com/photos/little-w/
Blog: Gulls to the horizon
Twitter: @Argentatus
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Re: Sub-adult European Herring Gull with tertial spots
Nice bird! Great pictures.