The familiar flight silhouette. An insistent call, loud and chattering, high up around the upper branches of a swaying Poplar, following by an effortless scything flight. The Summer-visiting Hobby Falcon was back. In this case, two of them – the first the agile flier, the second (presumably the female) slightly shy, keeping the branches between it and us as we gazed up. The call changed to the more familiar repetitive falcon kee-kee-kee-kee.. as the male completed an arc, in sight then out of sight, before returning along the far side of the trees, his wings at first spread in a fast approval and then folded in a shallow dive towards his mate. To us this seemed like the start of Summer. To them, no doubt, the start of the serious business of the breeding season.