To the best of our knowledge, the Adélie Penguin (Pygos-celis adeliae) has not yet been reported to be preyed upon by Weddell seals. The main predators of Adélie Penguins are regarded to be killer whales and leopard seals (Ainley 2002). In this study, we describe an observation of Weddell seal predation on Adélie Penguins in the Ross Sea and present a video recording of the Weddell seals’ hunting