One to ponder

I can confirm that this will be my last post about Yellow-legged Gulls. Well, at least for the next two weeks! I photographed this 2nd-summer bird at Rotherhithe on 7th July. It had me, and others that I've subsequently emailed, perplexed as it's not the most obvious of Yellow-legged Gulls - and indeed shows some characters you wouldn't normally associate with the species.

At the time I thought that it was potentially a Yellow-legged Gull based largely on mantle colour but obviously it has a fully dark eye, tepid bill colour yet the state of moult isn't ideal but it seems to show no white mirror on P10. There certainly seem to be too many features wrong for it being a cachinnans (which it isn't) - axilliary pattern and colour, tail pattern, legs and perhaps you’d ideally want some grey inner greater-coverts. If you ignore all the bare parts and eye colour you could say that there isn’t an awful lot wrong for michahellis. However, I'm not fully convinced it is a pure Yellow-legged Gull I wonder whether it could potentially be a hybrid... perhaps something like a herring x mich or even a mich x cach but that is just pure speculation.

Chris Gibbins added that the bird shows some mixed signals too, but pure birds are so variable anyway and in 2nd-summer plumage there are no ways to identify hybrids. Interestingly he also suggests that if it is a pure Yellow-legged Gull it may be sick and hence the dull/delayed development of bare part tones.

Thanks to Chris G, Stu P, Alan C, Josh J and Andy L for their comments.

German-ringed juvenile YLG at Rainham

Exciting news, well for me at least. Josh and I located a yellow-ringed juvenile Yellow-legged Gull 'H8J0' at the stone barges at Rainham on Saturday (21st July). A bit of detective work revealed it was part of the Helgoland ringing scheme in Germany - thanks to Paul Roper and Luka Jurinovic for this.

The bird had been ringed in a colony in central Frankfurt, as a chick, on 18th May 2012 - it was also seen by Dave Walker at Dungeness, Kent six days before our sighting on 15th July 2012. I've always wanted to know where all these YLGs that accumulate in the Thames come from - the southeast locality would suggest they're coming across from the near continent as opposed to Iberia.

Great day's gulling

I've got that bloody torch to thank for today's decent day. Received a text from Josh early morning, just before he headed my way, to say the Olympic torch was leaving Greenwich 7.21am - exactly when we'd have been going through the place on the way to Crossness. So a rapid change of plan and we headed to Rainham and parked by the stone barges. And on the first scan, a Caspian Gull was making itself look obvious on the near side of the gull flock. As usual, a bit of a beast of a bird sitting higher mantled than the surrounding Herrings and LBBs.

2nd-summer Caspian Gull - note the advanced state of moult with the inner greater-coverts moulted through. White mirror in old P10 noticeable on this image too. Tail feathers largely retained, forming a pretty scraggy tail band.

2nd-summer Caspian Gull - fortuitously standing in front of a Yellow-legged Gull, so you can just about (?) detect the paler mantle tone.

A Sandwich Tern flew high upriver at 8.30am, the stillness of the day allowing its call to carry what was at least half a mile. Rainham was ripe with Yellow-legged Gulls with at least 40 seen during the course of the morning; many adults, 2nd-summers and at least a dozen juveniles too. For once this year, the sun was a bit bright and a lot of haze got up and made decent shots tricky. While having a chat with a couple of typical Rainham-style punters over the finer details of Grey Herons and explaining that watching gull was a sign of a mis-spent youth, a really fresh juvenile Med Gull appeared in view - my first juv of the year and looking at its plumage state, can't really have been away from its colony long. A couple of Common Gulls were present too, but there was a real dearth of significant numbers of juvenile Black-headed Gulls once again.

juvenile Mediterranean Gull - about as fresh as they come out of the nest

One of many YLGs

Coming back home, we stopped off at Crossness which turned out to be pretty quiet in the heat with just half a dozen Common Sandpipers and 4 Black-tailed Godwits on the foreshore.

The London Olympics - the twattery has begun. No longer will I be able to get to Crossness with ease. If you're sticking around for it, enjoy. I won't be though.

Another close up look at a YLG in Rotherhithe

Came back from a day out, and checked 'the beach' just by the Hilton Hotel in Rotherhithe early evening. There was a nice 3rd-summer Yellow-legged Gull amongst the usuals, while the first local juvenile Lesser Black-backed were around too. Rotherhithe must be one of the best places to get decent views of Yellow-legged Gulls in Britain and it's surprising nobody else has decided to come down to have a look. Ever.

The following shots illustrate the active primary moult of this individual - the outer primaries (P7 to P10) are old retained feathers, while the new inner primaries are grey in colour (P1 and P2 are grown, P3 half grown and P4 can just be seen coming through) with P5 and P6 fully dropped. The old P10 shows a small mirror while there also seems to be active moult within the tail feathers (that retain some dark blotching). Some nice info on Yellow-legged Gulls here, especially when it comes to ageing.

London is the best place in Britain for...

Yellow-legged Gulls. The last few days of June, and then particularly throughout July, sees a build up of these birds along the Thames foreshore as they head north from further south in Europe. There are normally a few floating about any month of the year, but midsummer is the best time to see real numbers - including some rather smart juveniles such as the one below.

Juvenile Yellow-legged Gull Crossness 14th July 2012

There were 7 YLGs present on the foreshore this afternoon at Crossness. This included two juveniles - beating the paultry total of one juvenile Black-headed Gull in amongst the 1000 or so of them. Evidently breeding success has been horrific with the high water levels.

Living in a stone's throw of Stratford and Greenwich, it seems that the Olympic twattery has started with Olympic lanes, construction traffic and notifications to avoid areas meaning it took me almost an hour to get from Rotherhithe to Crossness today. Just as well I won't be here for the carnage when it actually starts as it's going to be a nightmare for London's population.

Caspian Gull in Rotherhithe

I spent most of the day doing some bits on my dissertation (don't ask, but it's as much fun as a dose of chlamydia (presumably)), though admittedly this was interspersed with a bit of river inspection. Trying to dodge the mid morning showers, low tide didn't reveal many gulls on the foreshore largely due to some ring piece and their dog scurrying around the usual larid haunt. Common Terns were pretty vocal around the flat today, but all adults and no sign of any young around here this year unfortunately.

Then to this evening, and with some lovely sunshine, I walked the couple of hundred yards to the river and found this distant 2nd-summer Caspian Gull on the river at the bottom of Rope Street, just west of Greenland Pier - a real surprise.

Round-headed profile with pixel thin dark eye, off pink legs, nice extensively dark based retained tertials and rather bleached coverts. Hope you can see all this from this photo!

Long, spindly legs pretty evident here despite the poor photo quality

Distance, poor light are the excuses... the centre of the underwing was nice and pale, there was a decent retained bar on the secondaries while even on this really poor photo you can just about make out a pale mirror to P10

It wasn't one for pictures as the barges at the moment are on the other side

of the river. However, I tried a few ways of getting decent images (including the video cam option) but none of them worked! I got a couple of flight shots, but with the flash going off due to poor light, they lacked the detail I'd usually get. I was pretty happy with this individual though, and as with the last and only Caspian Gull I found in Rotherhithe, it was pretty much on its own large gull wise. If you want to have a look at some better photos of 2nd-summer Casps click here!

A (little) bit of movement

It was pretty encouraging news from Rainham yesterday, where there were a whopping 7 Wood Sands on Aveley Pool. Having not been able to get out to Crossness since last weekend, I was out there early this morning schlepping it to West Paddock to check the flood. And, er, there was a Redshank and 3 Lapwings wader wise there plus an elusive Little Egret. All this rain just means no muddy margins, and the grass has grown too high to be able to see some areas! However, back on the foreshore some wader movement was evident - 8 Black-tailed Godwits still in summer kit, glowing in the sun. Though they all looked very nice, this early on in the season surely means they're breeding failed.

Icelandic Black-tailed Godwit, Crossness July 2012

Heading back to Rotherhithe as there was little else of note, the tide was good for gulls at what I call 'the beach' - an area of mud/sand on the bend by The Hilton Hotel, directly opposite Canary Wharf. Large gulls gather here, and offer close views so ring reading is easy, and just occasionally the odd Yellow-legged Gull decides to join the party. Like today... with this adult as well as a more distant 2nd-summer.

Yellow-legged Gull, Rotherhithe July 2012

Yellow-legged Gull, Rotherhithe July 2012