Gullible.....?

I appreciate that visiting a gull roost may not be everybody's idea of an exciting destination on a winter evening but Wilstone Reservoir is indeed a special place. As the sun sets gulls begin to fly in from all directions, landing on the water to bicker, preen, sleep or just generally loaf about. Thousands of them. Occasionally, perhaps spooked by a peregrine, they will all fly up in a flurry of snowy wings and settle again somewhere else. Tonight's roost was spectacular - the air still and the the sky an intense forget-me-not. My aim: to find the one Mediterranean gull amongst the thousands of black-headed and common gulls.A challenge indeed. At distance, and as the sun disappeared and the cold began to seep inwards, I scanned and scrutinised the individuals that made up the whole. The ultimate game of hide and seek. And there it was, it's differences subtle but diagnostic. A great sense of achievement...