Arizaga, J., and F. Bairlein. “The Role of Age, Sex, Subspecies, Body Size and Fuel Load in Determining the Social Status of a Migratory Passerine During the Non-Breeding Period”. Ornis Fennica 88, no. 3 (September 30, 2011): 154–160. Accessed November 24, 2024. https://ornisfennica.journal.fi/article/view/133778.