An article has been added about hybridization between Black-headed Gulls and other taxa:
http://www.ridibundus.gull-research.org/hybrids.html
Black-headed Gull articles
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
- marsmuusse
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Re: Black-headed Gull articles
Looking great, these combo's Maarten & Tim. Well done.