Gender determination from morphometrics in migrating Magellanic Penguins Spheniscus Magellanicu - Vanstreels, Ralph Eric Thijl; Adornes, Andréa Corrado; Ruoppolo, Valeria; Canabarro, Paula Lima; Silva Filho, Rodolfo Pinho da; Catão-Dias, José Luiz (Marine Ornithology, 2011)