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"In the Womb: Animals" is an unprecedented two-hour world premiere special that takes you inside the hidden world of animal pregnancy. Using state-of-the-art visual effects, computer graphics and real-time, moving 4-D ultrasound imagery, we can see inside the unique world of animal fetal development in a way never before possible. For the first time, these pictures shed light on how an elephant, a dolphin and a dog develop in the womb.

Witness a single cell develop into a baby elephant weighing over 260 pounds. Watch as a dolphin fetus learns to swim inside its mother's womb. See incredible images of a dog fetus as it exhibits full-grown dog behaviors while still in the womb. And watch as fetal features reveal their evolutionary path of these animals when the elephant develops ducts normally found in freshwater fish, and when dolphins show early signs of legs.

"In the Womb: Animals" opens a window into fetal development in the animal kingdom, unlocking mysteries of one of nature's most remarkable journeys—from conception to birth.

Don't miss this unprecendented two-hour world premiere special airing on National Graphic on Thursday December 14, 2006 at 9 PM EST.

Watch the video preview