The revelation means the park now has only one female king penguin, 30-year-old Bill, who when it was born was given the name because its size led keepers to believe she was male instead. Another ...

King penguins do not build nests. In their constricted space, the male and female take turns incubating a single egg balanced on their feet and covered by a loose fold of skin. They brood the ...

So to identify an individual, or even a male from a female, is difficult ... this has been seen before in their close relatives, king penguins, but it is extremely rare in an emperor penguin.