We live near Monmouth in South Wales close to a stream. Over the last week this dipper has appeared constantly at the window and seems to be performing some kind of courtship or competitive ritual. He walks in circles on our window railings, ruffles and preens, sings to us or simply stares through the window for 10-15mins at a time. He also frequently flaps against the glass. We would find it endearing if it wasn't for the fact he leave bird poo all over our windows.