Arizaga, J. and Bairlein, F. 2011. 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, 3 (Sep. 2011), 154–160. DOI:https://doi.org/10.51812/of.133778.