Ludynia, K., Dehnhard, N., Poisbleau, M., Demongin, L., Masello, J. F., Voigt, C. C., et al. (2013). Sexual segregation in rockhopper penguins during incubation. Animal Behaviour, 85(1), 255-267. doi:10.1016/j.anbehav.2012.11.001.