Lessons in jackdaw frolics

A noisy flock of about a dozen jackdaws flew into my airspace and I took a break from gardening to watch them. There was a stiff breeze and they were flying into the wind. They reached a clump of trees, dominated by a large Scots pine, which was obviously diverting the breeze and causing an up-draft.
This was an irresistible opportunity for a bit of fun and they spent the next 10 minutes making the most of it.