Scaup at Conwy

2 pairs of Red-breasted Merganser, dozens of Teal and Mallard, 30+ Canada Geese, 1 Snipe, 4+ Little Grebe, 5+ Coot, and I also managed to see one drake Scaup, although I don't think I got a photo! Many small groups of starlings rocketing over and also several Redshank on the shore.

Scaup, or Greater Scaup, Aythya marila, is a very common fully migratory duck in the Northern hemisphere, some of whom winter in the UK and a very few pairs breed in Shetland, etc.. There is a complex courtship ritual, leading to a monogamous pair bond for the season. They breed communally and the male abandons the nest to moult after the duck has laid her eggs. The duck takes care of the nest and then the young.

Aythya are all diving duck, collecting shellfish and plants etc. from the seabed as well as insects,and then eating them on the surface, Easiest to spot in the UK wintering on estuaries, including the Dee, Solway, Forth and Moray, and may be gregarious.

I saw a pair at Cliffe Pools December 2012, once they had been pointed out to me. I found this drake on my own but I had seen it posted as a possible on the board in the reception building, so I was prepared to see it. Still a good bird, and I got a good enough view to see the dark green sheen on the black head.

North Wales Coast, battered by severe storms

Amazing pair of Red-breasted Mergansers, many Common Scoters in small rafts off-shore, 1 Great Crested Grebe, 7+ Cormorants, 100+ Black-headed Gulls, 50+ Herring Gulls, 30+ Greater Black-backed Gull, at least one Common Gull, Larus canus.

This. I think, is a first winter Herring Gull from the streaky patterns on the wings and the still blackish bill, with little trace of yellow on it, and no white tip, and a dark eye. Also no sign of broadening of the white "New Moons" on the primaries. On the groyne by the Saint George viewpoint.

The greater coverts show 3 (2 and a half) rows of chevron-like blotches on the lower edge of the "wing", a much more confusing patch of blotches on the median and lesser coverts, and internal anchor-marks on the scapulars above. You can see the mid-grey on the inner part of the bill fairly clearly, particularly in the last photo. Because of the clarity of the pattern I am fairly sure it is a first winter.

I think this bird is probably a second winter bird, quite advanced perhaps. There is a lot of grey in the mantle, but no grey bar on the wing. The bill doesn't look so advanced, but there is a clear white tip to it. In this view this bird has quite a flat-topped head.

This bird in contrast is a third winter. Grey mantle, with only some remnants of brown barring on the wing, few/no obvious mirrors as yet, beak with obvious black markings across full depth of bill. Quite a lot more streaking down the neck than in the Book, but very similar to other photos on advanced websites. The eye is quite pale by now. Perhaps there is the start of a white tertial spot.

And here is an adult Herring Gull with a well-coloured bill with only a hint of black, and clear wing mirrors, a white tertial spot and no black markings on the tail. The head streaking is fairly light on this bird.

And even lighter on this one. I can't see a facial step here and the head looks quite rounded. A female perhaps:

Here is a picture of the wing mirrors on an adult with an immature bird behind. See how the immature bird is just starting a wing mirror on P6.


There were also some Greater Black-backed Gulls on the sand. Its interesting how they do tend to stick together at least to some extent. Fantastic large mirrors.

Holm oak leafminer at the services

This appeared to be Ectoedemia heringella.

Rained out again, at Leybourne

Yet another very wet day, no point in getting the telescope or camera out, so I just walked Monty around the round pond at Leybourne, betting thoroughly soaked in the process, just before dusk.

The swans, duck and coot just visible through the murk, but no gulls seen! 

Cliffe Pools on a nice day, but after low tide

Little Grebes, Great Crested Grebes, Cormorant, Lapwings, Redshanks, Shoveller, Mallard, Pintail, Gadwall, Wigeon, Teal, Coot, Common Gull, Larus canus, Black-headed Gull, Herring Gull. 

Black-headed Gulls adults

Head patterns

Head patterns of adults are quite variable over the winter. Here we are getting the double headphones pattern.

Same bird, head turned partly towards us with both headphones still visible.

This is the same bird again, this time looking more directly in our direction. The first headphone is quite clear, the second is now on the reverse slope of the skull, except for both its lower ends.

The beak colour here is as in Ohlsen and Larsson, going towards the "concolorous maroon" of the breeding season as discussed below.

It is worth remembering that the moult into breeding plumage is only partial - relating to head and body only. The bird has to rely on the wing and tail feathers formed the previous summer for its successful performance during the breeding season.

"Those individuals who moult their hood early apparently do so every year. What is interesting though is that their moult takes place over a much longer period of time than for those individuals who acquire their full hood during the regular moult stage. Those who have a normal moult do so very quickly, up to 10 – 15% a day. This means that a full hood can be acquired in around a week. The individuals that I have seen with early head moult (see examples below) took weeks before their hood was anywhere near completion." from the excellent "Gulls to the horizon" blog.

Beak colours

The beak colour seems to be generally orange in younger birds, ranging from yellow-orange to a more reddish-orange, and always with something of a dark tip (see non-adults page). In adults the beak colours seem to vary, being a bright to moderate red in late summer through to mid-winter, and then darkening to a dark blood red (maroon) as breeding approaches, often getting as dark as the dark tip of the bill, which itself slightly lightens until the beak can be described as "concolorous maroon". However in the mid-autumn it is often really quite a bright red, perhaps much more highly coloured than the winter mid-red. This could admittedly be an effect of higher light intensities.

This is a bird in mid-autumn seen at Barden in late October 2013, showing the moderately bright red colour to the bill:

This is a bird seen near Saint George in January 2014, and you can see how the tip is getting browner from the original black.

Weblinks for Black-headed Gulls

http://bhgullsni.blogspot.co.uk/

http://guernseygulls.blogspot.co.uk/

http://www.ridibundus.gull-research.org/01cymay.html

http://gullstothehorizon.wordpress.com/2013/01/05/the-p9-conondrum/

Sunny Cliffe Pools at low tide

Telescope views are wonderful in these well lit conditions and I quickly found the Black-necked Grebe in among the Little Grebes, Great Crested Grebes, Tufted Duck, Pochard, Goldeneye, Clangula bucephala, Black-headed Gulls and Coot at the back corner of Radar Pool. There were good numbers of duck overall with hundreds of Shoveler and Teal, and dozens of Pintail and Wigeon.

On the new beach there were hundreds of  Lapwings and no other waders. Some Wigeon and Teal were on the shoreline, but surprisingly few Gulls. A few Herring Gulls and Black-headed Gulls were scattered across Radar and Flamingo.