Philadelphia Zoo welcomes 3 penguin chicks

One of the Philadelphia Zoo's new baby penguins is named "Pancake" because his mother, a first-time mom, keeps sitting on him.

The two older penguin chicks are called Noah and Gilligan.

That's because a nest where they incubated was flooded before they hatched.

The penguin chicks hatched at the zoo May 11, 13 and 15.

They are members of an endangered species, the Humboldt penguin, and join 15 adult Humboldts at the zoo.