August 2022 – vol. 115, issue 8, pp 471 Monitoring the occupancy of shearwater burrows routinely involves using tape playback to elicit a vocal response from a nesting bird. This method is widely used by conservationists to census Manx Shearwaters Puffinus puffinus, but it is not known if shearwaters themselves use vocalisation to establish whether a burrow is occupied or not. Manx Shearwaters visit nesting colonies at night, ... This article is only available to registered users.To read more, please log in or purchase a subscription.