Emperor penguin couple

A pair of emperor penguins that are engaged in a recognition or courtship display. Note that there is no real discernable difference between the pair, penguins are unlike many birds where there is an obvious difference between the sexes, the males and females of all species having essentially identical plumage and markings.

This picture by Jérôme Maison. © 2005 Bonne Pioche Productions / Alliance De Production Cinématographique.
From the Warner Brothers film The March of the Penguins used here by permission of Warner Brothers.