The Daily Mail features a gallery of images of animals in the womb from the National Geographic documentary In The Womb: Animals that airs December 10. I'm not sure how much these images have been enhanced and altered with CG but they're still quite stunning.
From the Daily Mail:
Using a combination of three-dimensional ultrasound scans, computer graphics and tiny cameras, the team were able to show the entire process from conception to birth.
"These kind of images from inside animals have never been seen before," said Jeremy Dear of Pioneer Productions, who made the film.
"We worked with dozens of zoos and animal sanctuaries across the world. There were a lot of different challenges – recording a dolphin (image right) is very different from an elephant (image left), for instance.
"Animals were trained to sit still near the scanners and we also inserted cameras into the womb via the elephant's rectum-But it has been worth it. It one sequence we follow an elephant developing. When it is finally born, there is not a dry eye in the house.
Link to Daily Mail article,
Link to National Geographic's In the Womb: Animals (Thanks, Kirsten Anderson!)