Amongst the gulls returning to London from coastal breeding grounds, there have been a few gems recently. Most notably a Bonaparte’s Gull that was seen over several days at Crossness. But there have also been a few returning Yellow-legged Gull as well.
It was mainly this latter bird that I went out looking for this morning, starting with the Thames Barrier park at low tide.
There were large numbers of Black-headed Gull spread pretty evenly along the exposed shoreline (I suppose they don’t really need to huddle together in this heat). There were maybe high double digits of Lesser Black-backed Gull, low double digits of Herring Gull, and a small handful of Common Gull.
It was soon pretty clear there were no Yellow-legged Gull, so I focused on scanning the small gulls. I got lucky and found an adult Mediterranean Gull, always nice to see in summer plumage with its true black head (unlike the choclatey-coloured hood of the mis-named Black-headed Gull). The Med Gull was quite close in, but by the time I had got my camera out and ready, it must have flown. As I packed up and left, I saw one more juvenile Med Gull way down river in the distance so I took a grainy phone-scope shot for my records (and to inflict on my long-suffering readers).
By the time I had driven down the road and walked the rather epicly long path down to Creekmouth, the tide had come in rapidly and there was a much-diminished beach.
I checked the Black-headed Gulls floating around the Roding outflow, but couldn’t pick out any narrow-billed Bonaparte’s candidates, or any more thick-billed Med Gulls, so I turned my attention to the Beckton Sewage Works behind me.
It isn’t easy birding the sewage works but it had good numbers of gulls…
That view above is not typical or illustrative of reality. I managed to take it because my iPhone pressed up against the fence is small enough to get a good view, but a more accurate representation of what I was looking at is:
The pools in the photo are quite sizeable, and, at 40,000 square metres (Google Maps has allowed me to measure them), they are a third bigger than Heronry Lake on my local Patch.
I quickly found what I was hoping for on the water as one bird stood out quite well, despite the blurry distortions of peaking through such narrow meshing. It was a fair distance away so I didn’t get any good shots, but at least I had found a Yellow-legged Gull.
As it swam about in the treatment pools, it helpfully aligned up with a Herring Gull to give a better sense of size and bill thickness.
The morning wasn’t all about gulls, a pair of Peregrine performed for me and another local birder who I bumped into, Linnet and Grey Wagtail danced about on trees and posts respectively, and I got some stunning views of Reed Warbler which popped through the reeds and fencing to watch me walk past.