In Kensington Gardens, rather a lot of these:
They are pretty feisty - quite able and willing to take a few feathers out of a harmless passing pigeon, I noted today. I’ve no doubt that one could kill a pigeon if it felt like it.
Potential food supply spotted:
Almonds went down very well - their technique was to take two at a time, eat one, bury the other, and come back for more: