We are lucky enough to have pied wagtails – usually just one pair – in the garden every year. They raised a family and for much of the summer there were 4 patrolling the roof ridge. Recently, prolific evening fly hatches have provided them with great sport as they hawk for the insects from the roof, fluttering briefly into action and returning to their perch. On some evenings they have been joined by up to 2 dozen other wagtails, and for half an hour at dusk they have looped and swooped round and round, eating on the wing. I wondered if there was a collective noun for wagtails to go with the charms, murmurations, murders and parliaments that other birds are awarded. The only one I found was in a jocular list by a determinedly downbeat birder, who applied the term ‘a permanent narcissism of wagtails’.