One of the joys of an English summer is the sound of screaming swifts in the air. This is most common in May and June. The swifts are one of the first summer migrants to leave. It always seems a long time until they return again next spring. Usually the first ones arrive here by the end of April. Once, long ago, I found one on the ground. We kept it in a box overnight. The next morning it flew off as if nothing had happened. Swifts spend most of their time on the wing and if they do land on the ground it is not easy to take off again. I found this out much later. It was lovely to handle this scythe like bird.