Monday, 4 October, 2021, 10.52 am, Newmillerdam near main car park, sunny slight breeze: There’s a commotion amongst the black-headed gulls and a boisterous flock of 20 or 30 of them swoop and tumble over towards me from the outlet corner of the lake. At first I think that someone must be feeding the ducks and they’re falling out, as they do, over a snatched crust.

Then I notice that the pale brown ‘crust’ is moving about on its own account. My first thought is that for some reason the gulls have ganged up on a sparrow, but the manoeuvrability is un-sparrowlike and I wonder for a moment if it could be a late swallow or martin.

One of the gulls briefly captures it and it’s not until it escapes that I can see that it’s a small bat. It dodges around then escapes into the lakeside willows where the gulls can’t follow it and the gulls head off back towards the outlet.