Today's visit yielded a surprising result. A buzzard decided to fly over the city center, the first time I have ever seen them here, and so got charged by a screaming mother peregrine. They just orbited each other for a while before the buzzard flew off. This was the best image I could manage of both of them in the frame.
A short while after, the peregrine's airspace was penetrated again, this time by a glider which circled low over the city