Independent evolution of intermediate bill widths in a seabird clade
Juan F. Masello, Peter G. Ryan, Lara D. Shepherd, Petra Quillfeldt, Yves Cherel, Alan J.D. Tennyson, Rachael Alderman, Luciano Calderón, Theresa L. Cole, Richard J. Cuthbert, Ben J. Dilley, Melanie Massaro, Colin M. Miskelly, Joan Navarro, Richard A. Phillips, Henri Weimerskirch, Yoshan Moodley