GLAUC roosts for 3rd consecutive night - LGRE

WEDNESDAY 9 FEBRUARY

CALVERT SAILING LAKE (NORTH BUCKS)

I joined Warren Claydon and Steve Rodwell at Calvert to have a thorough check of the roosting gulls. Arriving at 1600 hours, we watched until 1745 hours when it got dark, the 13,000 or so roosting gulls at that time still being joined by line after line of birds flighting in from the landfill.

Highlight (certainly for me) was the juvenile GLAUCOUS GULL roosting for its third consecutive night, arriving at 1722 hours this evening. The regular first-winter CASPIAN GULL also roosted (seen by Steve only) as did one of the adults (WC) and as did a single adult winter MEDITERRANEAN GULL (LGRE). Other than that, 7 YELLOW-LEGGED GULLS were identified in the BBOWT pre-roost (6 adults and a first-winter) whilst estimated totals of other species included 5,000+ Lesser Black-backed Gulls (including numerous intermedius now) and 6,000 Black-headed Gulls with 115+ Common Gulls, 235 Herring Gulls (far fewer Argentatus now) and 151 Great Black-backed Gulls.

One adult Lesser Black-backed Gull was dyed dark green on the throat and upper breast whilst a Scandinavian Herring Gull with almost all white primaries was again present.

The BLACK-NECKED GREBE was still present, with a redhead GOOSANDER on the BBOWT Lake, 6 Great Crested Grebes, 7 Gadwall, 1 Pochard, a drake Wigeon and 25 Lapwings all noted.