It is September and the swallows have begun to leave, we are an island of comings and goings.

Acknowledgements:

Thanks to Sean Lysaght and Phil Barnett.

Kate St.John: https://www.birdsoutsidemywindow.org/2014/06/16/the-importance-of-tail-streamers/

Ornithology, Third Edition, Frank B. Gill

Czech Academy of Sciences, The extraordinary life of swallows: https://www.avcr.cz/en/news-archive/The-extraordinary-life-of-swallows.-What-do-we-know-about-them/