AbstractCleaning passerine nestboxes after birds have fledged is widely thought to remove parasites such as fleas. Experiments are now described that examine the value of cleaning such nests after use.Keywordscleanliness of nestboxesparasitesfledgling successReferences1. du Feu C.R. (1992) How tits avoid flea infestation at nest sites. Ring. Migrat., 13, 120–121.2. Perrins C.M. (1979) British Tits. New naturalist, Collins, London.
