Citation
Thaxter, C.B., Daunt, F., Hamer, K.C., Watanuki, Y., Harris, M.P., Gr. 2009. Sex-specific food provisioning in a monomorphic seabird, the common guillemot Uria aalge: nest defence, foraging efficiency or parental effort?. Journal of Avian Biology 40: 84. doi:10.1111/j.1600-048X.2008.04507.x