Feisty swallows

I was a bit too late with the camera so you'll have to trust me that the picture of a buzzard shows a buzzard retreating after being mobbed by swallows as it sat on the roof of the barn containing a swallows nest. A few weeks ago I saw a single swallow chasing away a medium sized bird of prey, about sparrowhawk size, who couldn't move away fast enough. It is impressive to watch small birds see off much larger enemies as they use their agility and speed to make up for the difference in fighting weight. I was reminded of Arctic Terns attacking Great Skuas and in turn being seen off by the tiny Wilson's Storm Petrel but in terms of size differential this is just as impressive.