Gilg, O., Moe, B., Hanssen, S.A., Schmidt, N.M., Sittler, B., Hansen, J., Reneerkens, J., Sabard, B., Chastel, O., Moreau, J., Phillips, R.A., Oudman, T., Biersma, E.M., Fenstad, A.A., Lang, J., Bollache, L. 2013. Trans-Equatorial Migration Routes, Staging Sites and Wintering Areas of a High-Arctic Avian Predator: The Long-tailed Skua (Stercorarius longicaudus). PLoS ONE 8(5): e64614. DOI: 10.1371/journal.pone.0064614.