Emperor penguin moms rely on sound to find their babies.
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"Snow Chick" premieres Feb 24 at 8/7c on PBS. Check your local listings. http://www.pbs.org/wnet/nature/snow-c...

After marching up to 125 miles across the sea ice, female Emperor penguins must locate their chick among the thousands of others in the colony. Unfortunately, the chicks and their dads all look exactly the same. To find her male partner and their chick she issues a unique call which her male partner can identify.
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