 Signorini stated they had been inspired by a photograph of fossilized dinosaur tracks, and showed the reporter the huge penguin feet made of iron used in creating the tracks.There were numerous prehistoric species of gigantic penguins (such as "Pachydyptes ponderosus" and "Anthropornis nordenskjoeldi"; see also Palaeeudyptinae).However, actual prehistoric megafaunal birds only occurred in South Pacific and Cape Horn ocean waters.