Thursday, 22 June 2017

Larus a. argentatus-like Herring Gull on Portland

Herring Gull (Larus argentatus argenteus / argentatus) - Portland Bill, Dorset, UK

Adult bird: photographed 27th May, 2017

On the morning of May 27th there was a flock of mainly large gulls, close onshore, at Portland Bill. Among them was this adult Herring Gull. It was noticable among the other birds, particularly while in flight, due to the large amount of white on p10 (both wings).

Inspection of these photos reveals a trace of black present on the inner edge of p10, near the tip, on the left wing at least. P9 shows a small white mirror. More interestingly, feather p5 has 'no black', except for a slither on both edges. Large, white wingtips were most obvious on the resting and swimming bird.

I have read that this combination of features can be shown by L.a. argentatus. The Portland gull's mantle was the same colour grey as the many L.a. argenteus birds present, but it is recorded that Denmark and the NW German L.a. argentatus can be similarly pale-mantled. re. http://www.gull-research.org/hg/HG5CY05.htm

I would be grateful for an opinion and comments from those with expertise and experience on this subject as to whether this bird is likely to be racial intergrade, or L.a. argentatus - as I have seen photos of a bird with what appears to exactly this upperwing pattern and colouration, (taken in the Netherlands), labelled as L.a.argentatus. on the gull-org website.

Thank you.



















Tuesday, 4 August 2015

2 CY Bonaparte's Gull - at Ferrybridge, Portland.



Bonaparte's Gull (Chroicocephalus philadelphia) - Ferrybridge, Portland, Dorset, UK

Photographed 7th March, 2015


Click on photos to enlarge.





Soon after dawn on Saturday, March 9th 2015, a probable Bonaparte's Gull was reported in flight off the Chesil Beach from Chesil Cove, Portland by local birder Charlie Richards. The bird was soon after located with Black-headed Gulls at nearby Ferrybridge where it was watched at close distance by a number observers. The bird stayed on locally for a number of days.

More photos to follow.


'Madeira' Yellow-legged Gull, 2nd Calendar Year.

Atlantic Yellow-legged Gull (Larus michahellis spp) - Canical, Madeira, Portugal

 2nd calendar year bird 3: photographed 4th July, 2015


Click on the photo block to enlarge.

Monday, 3 August 2015

'Madeira' Yellow-legged Gull, 2nd Calendar Year.

Atlantic Yellow-legged Gull (Larus michahellis spp) - Madeira, Portugal

 2nd calendar year bird 2: photographed 3rd July, 2015


Click on the photo block to enlarge. 


 Moult stage July 3rd: p1-5 new, p6&7 growing, p8-10 old.


Saturday, 1 August 2015

Atlantic Yellow-legged Gull, juvenile - bird2

Atlantic Yellow-legged Gull (Larus michahellis atlantis), Madeira, Portugal

Juv bird 2: photographed 3rd July, 2015


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Larus michahellis atlantis - 1 CYear - bird 2 - more white in tail.


Friday, 31 July 2015

'Madeira' Yellow-legged Gull, 2nd Calendar Year.

Atlantic Yellow-legged Gull (Larus michahellis spp) - Madeira, Portugal

 2nd calendar year bird 1: photographed 3rd July, 2015


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Moult stage July 3rd: p1-7 new, p8 growing, p9-10 old. Central tail feathers missing.


Thursday, 30 July 2015

Yellow-legged Gull, a 'Madeira adult'

Yellow-legged Gull (Larus michahellis spp) - Madeira, Portugal.

Adult bird 3 : photographed 3rd July, 2015


Click photo block to enlarge.