Monday, 4 January 2016

BONAPARTE'S GULL at Wilstone - a First for Hertfordshire

Well it just goes from bad to worse. Not content with gripping me off with a BONXIE that lasted only too briefly at WILSTONE last November, Dave Bilcock managed to successfully well and truly do the double this morning when he photographed an adult BONAPARTE'S GULL from the jetty. Apparently, Roy Hargreaves had stumbled upon the bird at about 0850 hours, pondering upon its identification for a while before it flew and revealed its diagnostic wing pattern. He then telephoned Dave to tell him the bird had flown towards the Dry Canal but as Dave arrived on the scene, the bird must have double-backed and joined the Black-headed Gulls loafing along the Cemetery Corner edge of the reservoir. Dave phoned me immediately and other local observers while Roy hastily contacted Ian Williams and Rare Bird Alert. From onsite at 0934 hours, Dave tweeted two images he had just taken through his 'scope on Twitter, at which time I sped over. Unbeknown to me, Dave then had to leave to take one of his teenage daughters to Brighton, leaving the bird still on the reservoir edge.......
Francis Buckle and Mike Campbell arrived on site within 5 minutes and hotfooted it round to the jetty. According to Dave, who saw both observers arrive, the Bonaparte's was still present in the roosting gulls. Stuart Wilson joined them very quickly afterwards and within 20 minutes, I was on site. At one point, the Black-headed Gulls had all flown up but quickly resettled, but search as hard as we could, the bird had somehow managed to get out and had disappeared. Disaster! Over the next hour, I grilled every last 173 Black-headed Gull on the reservoir, before relocating to Startop's End to check the flock loafing over there. I also went through every Black-headed Gull in the fields south of the Dry Canal, as well as birds in Pitstone Quarry and at College Lake BBOWT. It had vanished. The Wilstone pre-roost gathering of Black-headed Gulls gathered pace from about 1430 hours but instead of the usual 1,500 or so birds, less than 250 turned up and despite the best efforts of DB, IW, WC and I, it was not to be. I rushed over to College Lake before dark, but could not find it among the 850 or so Black-headed Gulls roosting there. What a fiasco and yet another dip on a County First - ditto the Hilfield Park/Amwell Laughing Gull!
Anyway, this is what I did see!
On WILSTONE, highlights included the continuing COMMON SHELDUCK, 63 Greylag Geese, 115 Mallard, 10 Gadwall, 78 Wigeon, 370 Teal, 155 Pochard, 142 Tufted Duck, a pair of COMMON GOLDENEYE, 348 Lapwing, 153 European Golden Plover, 6 Little Grebe, a 2nd-winter Herring Gull and Grey Wagtail.
On STARTOP'S END, the adult drake GOOSANDER of the last few days was joined by a female, both flying off late morning, with the first-winter drake GREATER SCAUP showing well in the SE corner, 4 Little Grebe, 231 Coot, 14 Pochard and another Grey Wagtail.
TRINGFORD produced Red Kite and Common Kestrel, along with a single Little Egret, 9 Grey Heron, 22 Teal, Green Woodpecker and Kingfisher, while 38 SISKIN and 6 Goldfinches were feeding on Alders in the 'Rookery'.
Both CETTI'S WARBLER and COMMON CHIFFCHAFF were on MARSWORTH, while at the evening roost, all 3 EURASIAN BITTERNS were on view (one performing admirably), with 6+ Water Rails squealing and 16 CORN BUNTINGS in at the reedbed.
COLLEGE LAKE BBOWT held the 2 EGYPTIAN GEESE that I had found at Startop's yesterday morning, along with the pair of RED-CRESTED POCHARD, 125 Coot, 65 Gadwall, 20 Wigeon, 25 Pochard, 97 Tufted Duck, 72 Lapwing, the Coal Tit and 7+ Reed Buntings.
I could only find 1 of the 3 wintering COMMON STONECHATS on PITSTONE HILL, where 33 Fieldfare and 2 Redwing flew west

Let's hope the Bonaparte's Gull gets relocated - hats off to Roy and Dave for yet another star-spangled find!!

Adult winter Bonaparte's Gull, Wilstone Reservoir, 4 January 2016
(David Bilcock, 0930-0934 hours)

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