Genders of zoo's baby penguins a mystery

They call the little guy "Samson," but the zookeepers know that might have to change.

That's because no one knows whether the Memphis Zoo's penguin chick, hatched just a little over a month ago, is a boy or a girl.

Penguins, you see, have no external reproductive organs, so the only way you can tell if it's a "Mr." or a "Ms." is to do a blood test -- or wait for an egg.

So for now, the three baby penguins at the zoo -- Samson is joined by Dee Dee, 18 days old, and Liam, 14 days -- will keep their given names.