Our local rooks tend to get very protective of their territory when it gets close to the nesting season, but they've started extra early this year.
Walking round Wapley this afternoon, I was out on the Common when I heard the rooks calling and saw the full squadron launch. I immediately thought "Buzzard alert!", and I was right - a few seconds later a pair of buzzards appeared above the wood, being mobbed by the rooks.
One buzzard fled immediately, but the other was inexperienced enough to try to stick around. It soon realised the error of its ways! A rook is very agile and can very nearly turn within the wingspan of a buzzard. An outnumbered buzzard is not going to be successful.
Actually this was slightly different from previous occasions - the rooks were using different tactics. I normally see the rooks zooming up towards high-flying buzzards, but this time they got above the buzzards and were forcing them down towards the tree canopy where they wouldn't be able to manouvre easily. Isn't nature fascinating?