The XO Directory

Using a combination of three-dimensional ultrasound scans, computer graphics and tiny cameras, the same team who in 2004 showed how human embryos "walk in the womb", were able to show the entire process from conception to birth in animals. This images reveal exactly how animals develop in the womb.

"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 is very different from an elephant, 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.

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