The Yellow-billed kite Milvus aegyptius parasitus takes a holiday up in north Africa between breeding sessions, and returns from about August onwards to get back to business. At first, groups of them are common, but as summer gets into gear one sees singles and doubles jealously guarding their territories. It’s Not This Time of Year Without…them signalling the accelerating approach of summer and holidays and the Festive Season and all. The first to see their return says gleefully, ‘The YBKs are back!’ Later comes the announcement, ‘The YBKs are pairing off!’
By the same token the statement, ‘The YBKs have left,’ is given in a doleful voice.