Angela K. Turner and Clive R. Barlow / February 2023 – vol. 116, issue 2, pp 105–109 Abstract Using museum specimens and field observations we examined the occurrence and timing of rump moult in House Martins Delichon urbicum in the non-breeding season. Individuals with brown rumps, some of which were particularly dark, were widespread in sub-Saharan Africa and occasionally occurred in Europe. The extent of brown feathers in the rump also varied between individ... This article is only available to registered users.To read more, please log in or purchase a subscription.