It has all been happening at Alnwickhill over the festive period. The lack of workmen on site has tempted back a flock of 90
Lapwing along with a variety of wildfowl including
Canada Geese,
Mute Swans and 7
Goosander. After a couple of days of gales, when the best I could manage was a colour-ringed
Herring Gull (green-white-green on right leg - maybe from a Glasgow project?), today's calm conditions brought the gulls down in droves to bathe. A very brief visit this morning gave views of a 2CY
Common Gull with dark markings on the tail and tertials - an uncommon plumage type that I don't think I have seen before.
This afternoon I had a little more time and was treated to squadrons of
Herring Gulls dropping in to bathe in the nearest pool - not something they do very often and I think it is possibly related to wind direction. In amongst these I managed to pick out a couple of individuals showing the
thayeri pattern on P9 as well as a couple of darker individuals with much white in the primaries - presumably northern
argentatus Herring Gulls. In addition there were plenty of
Common Gulls and
Black-headed Gulls, as well as single
Great Black-backed and
Lesser Black-backed Gulls.
Biggest puzzler was the following bird which resembled a hybrid
Herring Gull x Lesser Black-backed Gull but on reflection must be a subadult northern
argentatus Herring Gull. One difficulty with its identification is that these northern
Herring Gulls normally have a restricted amount of black in the primaries but this bird has black markings extending to P5. Of course this may be normal for birds of this age. It may, of course, be a darker than normal southern
argentatus.
Obviously it is the upper bird in the first photo, which shows a pale mantled
argenteus Herring Gull in front. The second picture shows the spread wingtip pattern.
The underwing can be seen in the shot below and this is followed by another shot of the bird on the water bathing with a
Herring Gull.
Finally, some shots of the bird perched with
argenteus Herring Gulls. Notice that the contrast between them and the
argentatus appears less. In the last shot the difference between the two gulls does seem to be appropriate for northern
argentatus and local
argenteus.
Thanks to feedback from Stephen W and Andy (tittletattler) on BirdForum on this bird.
Here are some other pictures taken at Alnwickhill today:
Lesser Black-backed Gull (note the
Black-headed Gull advancing into breeding plumage in the foreground - not the full hood it looks like from this angle but half-way there)
adult northern argentatus Herring Gull (much white on wingtips and darker upper parts than bird to its right)
thayeri-pattern Herring Gulls - two different individuals both with
thayeri pattern on P9 (not quite visible in upperwing shot)
Lapwing
Goosander (left of centre) and preening
Great Black-backed Gull (far right, honest!)
Grey Heron,
Mute Swans and
Canada Geese
Not a bad haul for Alnwickhill!
