National Geographic takes you inside the hidden world of animal pregnancy in a way never before possible. Featuring state-of-the art visual effects, computer graphics and real-time, moving 4-D ultrasound imagery to take viewers inside the unique world of

National Geographic takes you inside the hidden world of animal pregnancy in a way never before possible. Featuring state-of-the art visual effects, computer graphics and real-time, moving 4-D ultrasound imagery to take viewers inside the unique world of animal foetal development, these remarkable pictures shed light on how an elephant, a dolphin and a dog develop in the womb. For the first time, National Geographic opens a window into foetal development in the animal kingdom, unlocking the mysteries of one of nature's most remarkable journeys - from conception to birth.