This year's youths are released

It's been wall to wall sunshine since last Sunday's post. What that has meant is breeding birds have been in overdrive ,and it has been nice to get out and about locally. Rotherhithe has been quiet, though I had two Lapwing over yesterday evening; normally a bird I'd associate with cold weather movements in Inner London, as opposed to post-breeding dispersal like these birds.

adult Mediterranean Gull Crossness 13th July 2013

Crossness is now packed with birds, 99% of these being Black-headed Gulls. I spent an enjoyable evening here on Thursday, as well as today, just lapping up the close views in the warm light. Just one adult Mediterranean Gull and an adult Common Gull in amongst them. Though I must admit that each year I think the same - juvenile Black-headed Gulls are mega looking birds and each one is very different. The extent of the nape shawl through to the amount of scapular, covert and tail moult... just feast your eyes on these bad boys, some of them already moulting through to 1st-winter plumage.

On Thursday, I also managed to see my first juvenile Lesser Black-backed Gull for the year while juvenile Common Terns were present then and tonight too. Highlight tonight though was a Sandwich Tern heading rapidly west midriver, calling as it went. Bizarrely, when I was at Rainham RSPB this morning watching a rather nice but heat-hazed adult Pectoral Sandpiper, I mentioned to Nick Croft that days like today can be decent for Sandwich Terns. So it proved. While trying to locate gulls (unsuccessfully) on the foreshore near the stone barges - they're tipping out of sight currently - a Crossbill flew west calling; a bit of a surprise but there seem to be a few moving at the moment.

Fun in the sun

This weekend could have been so different. Friday lunchtime, and news of an Ascension Frigatebird chilling out on a harbour wall on Islay meant that another trip north was on the cards. However, news filtered out that it had flown off before the usual spurious rumours about further sightings filtered out. Looking forward to my parents arriving for a nice day out, for once I decided to act sensibly and chill out and let the rest of the big d*ck players head north. I awoke on Saturday with some relief, though not totally unsurprised - and went on to have a relaxing, nice day in the sun visiting some of London's tourist attractions with good food and company. This only slightly tempered by one of the local birders, Mike R, finding perhaps one of last year's Bonaparte's Gulls (now in summer plumage) at Crossness.

Today, the chillout in the sun time continued albeit with an early start. The Bonaparte's Gull showed pretty well throughout the day (I had an early morning showing and then returned in the afternoon). Nice to see a slim yank amongst our fat Black-headed Gulls. I've had these images looked over by American gullers just to see whether they could nail any 3cy characters, but unfortunately not so. Just like our Black-headed Gulls, a 3cy Bonaparte's would show a dark smudge on the primary-coverts as well as perhaps some dark shafts in the outer primaries, smudges on tertials or an isolated dark mark in the tail. However, these features can be moulted out by Black-headed Gulls by this time of year, so the same is probably true for Bonaparte's Gulls (as well as some 3cy Bonaparte's and Black-headed Gulls just mimicking adults anyway). There were also a couple of adult Mediterranean Gulls that appeared, and then disappeared, as well as a Little Egret on the Thames foreshore early morning.

I'd arranged to team up with John A, James L and Graeme S to do a bit of summertime nature watching in Kent. First on the agenda were the Heath Fritillaries at East Blean Woods that, as usual, showed pretty well mid morning before they started to get a bit more active with increased heat.

Nearby, at least three male Red-veined Darters were seen. Very nice to see, though must admit that Odonate aren't my speciality and I just duded it up, enjoying these little critteres, with special thanks to James L for use of his macro and 70-200mm lenses.

Back in Rotherhithe, I saw my first juvenile Black-headed Gulls of the summer here as well as a 2nd-summer Yellow-legged Gull on one of the barges near Greenland Pier. This rounded off a pretty good, sun-soaked weekend. Just five days of crazy kids in boling classrooms to deal with now.

Bridled Tern on the Farne Islands

It has been 25 years since the last truly twitchable Bridled Tern. Always viewed as the 'commoner' of the two dark-backed terns, the Sooty Tern on Anglesey in 2005 has meant that most of today's listers have seen the latter but not the former. So when a lovely adult Bridled Tern turned up on the Farne Islands, a load of Britain's finest were chomping at the bit.

I actually saw a Bridled Tern from a boat on the way to the Black-browed Albatross in June 2006, along with a number of others, though bizarrely the wise men didn't seem to like it for some reason. So guess this week's Bridled Tern satisfies those BOU listing slaves. Anyway, Puffins, Arctic Terns and loads of other auks and Eiders, plus a dozen Manx Shearwaters thrown in, reminded me that there was more birdlife in Northumberland compared to London.

Local birding heals the wounds

It's been a week or so since I last posted. The week just gone has been a hard one, as completely unavoidable work commitments meant that I missed what could be my only chance of a White-throated Needletail in Britain - the first bird I've missed (that I feasibly could have seen) for over a decade.

Right, the less said about that the better and time to try and move on. Locally, it has been predictably quiet although the female Long-tailed Duck lingers on, having transferred back onto Canada Water a couple of days ago. Three ringed Herring Gulls have come from different schemes - Suffolk, Sussex and the NTGG - and a Mute Swan I saw this morning seems to have been ringed in Derbyshire or Yorkshire.

This morning, I had a good walk around Crossness, and compared to last weekend, it felt just a tad bit more dynamic. There were a thousand or so Black-headed Gulls, including five juveniles (my first of the year), while adult and 1st-summer Mediterranean Gulls were subtly roosting in amongst them. Three Yellow-legged Gulls (two 2nd-summers and a 1st-summer) were an increase too.

adult and 1st-summer Mediterranean Gulls, Crossness 30th June 2013

Still she stays in Rotherhithe

June is always grim round these ends, but having a quality bird, the female Long-tailed Duck, within walking distance of my flat at this time of year has meant only one - I have become a slave to the bird. Before work each day I check on her, after work I have been checking on her and then when I can't find her I worry. Well, not quite, but when she's been absent from Canada Water - just like today - I've checked other areas of the patch to find her. And this evening, for the first time, she was on Surrey Water.

Other goings on in Rotherhithe include one unattached Reed Warbler still singing his heart out by Canada Water station, Common Terns fishing in Canada Water (though no nests occupied at Surrey Water once again), at least two pairs of Egyptian Geese roaming around and good numbers of Sand and House Martins can consistently be found over Surrey Water.

Pacific Swift in Suffolk

I recently got accused of losing it - the impetus to see rares that is (following on from my comments about the Bee-eater in Kent last Sunday). So while the accuser is seeing his owls and woodpeckers in Finland, it was time to put the record straight at 10.45am today.

I had a bad start to the day, going to Tesco to buy some bread, only to find that 'my' Long-tailed Duck that I was going to entice had done a bunk from Canada Water. I got back to Greenland Dock to check out 'my boys' (even Karen realises that when I say this, she knows it's the local gulls). Then came one of those numbing moments when the dulcit tone of the Mega Alert starting to go off, announcing that a Pacific Swift had been found at Trimley, Suffolk at 10.40am.

Within 30 seconds, I was in my trusty Focus and on the road. The adrenalin of chasing a Class A rare was back. Pacific Swift is no Bee-eater, it's no run of the mill dross that is a weekend filler if little else is about - during the day twitches like this are what us boys live for. One hour and 45 minutes later, I pulled in along the lane and parked up with news of the swift's continued presence. I'd only ever been to Trimley once before (for a stonking summer plumaged adult White-winged Black Tern in June '96), but I remembered that it was a fair walk. This time, the walk turned into a jog and to be honest it wasn't too far. But far enough when there's a big bird, that could fly off any minute, at the end of it. Josh J, Matt M, Justin L and Shaun H joined in the fun - including some news that it had done one only to return - but after half an hour or so, we clapped eyes on the crowd and this is what was waiting for us: -

Pacific Swift Trimley SWT, Suffolk 15th June 2013

The bird itself was pretty sweet, nice and scythe shaped with a more attenuated rear end and obvious forked tail compared to the hundreds of Common Swifts. Especially in the sunshine it was obviously browner - not quite Alpine Swift brown, but getting there - and its flight was slightly more laborious, with more leisurely and deeper wingbeats.

I spent a couple of hours on site, just lapping it up. It's not often that a bird turns up these days when I haven't got any other commitments. I managed to get into the hide for a little bit of papping, and the walk back to the car was nicely timed just before the heavens opened. Good to see the likes of John P and Alan C, as it's not often I get dragged out of London on a summer's day these days.

Anyway, Pacific Swift is my first new WP bird of the year, though hopefully I'll get a couple more next month in Egypt. And it has been a bonkers start to 2013 for me on the British scene, what with the Pine Grosbeak and the Svensson endorsed Dusky Thrush. Bring on the autumn for more tickage please.

Visiting a Caspian Gull colony

Two weeks ago I was privileged to visit a 'Caspian Gull colony' in southern Poland with the master of all those green and yellow rings, Jacek Betleja, that all gull fans love to read. I first made contact with him having seen one of his green-ringed birds, 355P, in January last year and he kindly coincided his first visit of the season with my visit to Poland. Late May is an excellent time to visit the colony, with some chicks already hatched, and adults actively feeding them. This colony is located on a grassy island, in the middle of a gravel pit, so there's only one way to get there - Jacek's blow up boat.

The gulls here at Jankowice, near Zator, nest in long grass so you can appreciate that when any ringing takes place all the adults fly off, so you're left with lone chicks. Although I was slightly comforted by the large proportion of adult birds that fitted well within the parameters of Caspian Gull, there were some birds that showed mixed characters (mainly with Yellow-legged Gull). Therefore, with the adults gone, the official line from the Polish Ringing Scheme for ringing these chicks is to call them 'Larus cachinnans colony': -
- chicks ringed in mixed colonies where Larus cachinnans is the dominant species (it is most likely that these chicks are cachinnans, but other species and hybrids are not excluded); this is the most common code, because most colour-ringed birds are from southern Poland, where this species is the dominant one.

Caspian Gull egg



typical Caspian Gull nest scrape in long grass/nettles

Each nest typically contained two chicks, sometimes three

With this breeding colony at a lower latitude than many of the Herrings Gulls that either breed in or visit Britain, this Caspian Gull colony's breeding cycle was more advanced - an explanation for typically more advanced moult of Caspian Gull. The chicks were typically the size of those shown above, though some were rather larger: -

As well as freshwater fish, these gulls are still suckers for human rubbish even within the breeding season. Chicken wings and sausages were just some examples of the detritus that the doting parents bring back for their offspring, with all sorts of rubbish scattered around the nest scrape.

Anyway, Polish Caspian Gulls ringed by Jacek have of course been seen on many occasions in the UK, and have reached as far west as A Coruna in northwest Spain. The older ringing scheme uses green rings with white writing (three numbers and then a P) and the newer rings - easier to read in the field - start with a P and then are followed by three letters. I managed to read 18 different ring combinations, with histories of birds mainly centred in Poland as you'd expect, but also some visiting the Czech Republic, Hungary and Germany.

492P was born at this colony in 2009, and returned again in 2011, as well as having been seen in the local area on a couple of occasions too.

Born in 2009 at this colony, this is the first time PADK has been seen back at its place of birth, now presumably as a breeder. It has been seen several times in southwest Poland, as well as in Budapest, Hungary on 9th March 2011.

This area of Poland also supports most of the country's Night Herons, and it was good to see adults at close range coming into the colony on the same island as the Caspian Gulls.