Cassiobury Park - 11.7.11

1 of the Little Owls was still around as was the Whitethroat singing somewhere from the old cress beds. But it was when going to shut the toilets that all of a sudden around 100 Black-Headed Gulls appeared from all over the place and started thermalling over the Langley Way entrance. They were joined by 6 Lesser Blacked-Backed Gulls but no sooner had they arrived they all dispersed!