Two male Humboldt penguins cautiously guard the entrance to their cave in the "Zoo am Meer" zoological park in Bremerhaven, northern Germany, where they are fostering a six weeks old penguin chick.After a penguin egg had been abandoned by its biological parents, it was placed in the male penguins' nest, who then adopted and hatched it.
Bremerhaven zoo veterinarian Schoene said the male birds, named Z and Vielpunkt, are one of three same-sex pairs among the zoo's 20 Humboldt penguins that have attempted to mate.
AP Photo/Focke Strangmann
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