The skua and penguin with title billing in this book are specifically the South Polar Skua (Catharacta maccormicki) and the Adélie Penguin (Pygoscelis adeliae), More specifically, they are the populations of those two species that breed at Cape Bird on Ross Island, Antarctica (77°14'S, 16628'E), where the author and his students and colleagues conducted research during 1965-1970, Young presents the results of that research (with apologies for the long delay), using later research conducted by others on these species to help evaluate and interpret the findings from his program,