Antarctic Nightmare Bird

Antarctic nightmare bird (TBA) is a large flightless predatory bird descended from South American terror birds that made it across the land bridge during the ice age. They resemble the extinct titanis bird, but with longer feathers to survive blizzards and Haast's eagle-like feet to walk on the ice without slipping. Their prey are all penguins, seals, and whale calves. They can swim, unlike their fully-terrestrial ancestors.