The film presents the breeding cycle of the sand martin from burrow excavation till the leave of the young of the first brood. The following stages of the breeding cycle are shown with the behaviours typical to them: Burrow excavation, nest-building, pair-flights, caring for the chicks at the burrow entrance, luring and leading of fledgelings by the parents and the behaviour of independent chicks. A considerable part of the species' rich vocal repertoire is presented with the corresponding behaviour.