Alan Dalton post's birding diaries and original artwork from Sweden. Established in 2006, this now long running blog is now a complete overview of my birding experiences. As an artist I greatly enjoy sketching birds in the field and you will find a wide selection of that work here, from fieldwork to finished paintings. I am very passionate about my artwork and try to depict birds in their natural habitat, as I see them in the wild. My artwork is for sale and can be viewed at http://www.alandalton.net/
As regards to my photography, since 2008 I have used a Nikon D90 DSLR camera coupled with a Sigma 150-500mm OS lens for since March 2012 for bird photography, all previous images being digiscoped. Regarding sound recording, I have been usung a Telinga Stereo Dat Mic and parabol to record birds in the field, coupled to a Marrantz 661 digital recorder, a superb piece of kit. Interest in butterflies, dragonflies and damselflies has recently seen the accquisition of a Sigma 150mm macro lens. I hope you enjoy the blog and please feel free to leave comments or contact me at alandltn@gmail.com

Wednesday, July 27, 2011

Variability in Second Calender Argentatus Herring Gulls

 A rather pale bird, the moult in progress very obviously. Typically rather whitish on the head, neck and breast...




 A rather pale individual, large billed and probably a male. A number of birds show a pale bill base such as this bird with a darker tip or band. The longest primaries have been dropped during moult...




 A third year for comparison. By the third calender year Argentatus is more uniform in appearance generally. Aged by pale iris, bill markings and tones, largely grey mantle and scapulars and the new blackish primaries with white tips...




 A pale bodied bird, not so advanced in the moulting process, accounting more the marked upperparts...




 Yet another bird. No two it seems, are identical...




 Yet another palid bird. Wear on feathers affects the appearance, as does exposure to sunlight and abrasion.




 A few more here...


 A deep billed, darker looking individual...




 Anothe pale bird displaying that base bill base and dark tip reminiscnt of Glaucous Gull in firsy year plumage...




 Again the longest primaries dropped accounting for the short ended appearance...




Note the new primaries growing out, this the same bird as that at the top of the post...

Thirty-six in this age group were present at Skeppsbron and as always the variation was striking. A lot of shots were taken, the results help give an insight into just how different to each other....



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