Crossvallia unienwillia

Crossvallia unienwillia is a giant extinct penguin (Sphenisciformes) from the late Palaeocene of Antarctica's Seymour Island, standing approximately 1.65 m tall and weighing an estimated 80 kg. One of the largest penguins ever discovered, it was a pursuit-diving piscivore in the warm shallow seas surrounding Antarctica before significant polar glaciation. Named after the Cross Valley Formation and Willem Jan Quax of the Antarctic Heritage Trust, it documents the early radiation of giant penguin forms.