Ground-breaking photos of animals in the womb

But the cameras for this joint National Geographic Channel and Channel 4 series - from the same people who brought us last year's unforgettable images of baby elephants seemingly dancing in the womb - have traced his incredible journey, from conception to birth, using revolutionary film-making processes.

Ground-breaking photographic techniques, plus state-of-the-art graphics, 4-D scanning techniques and the most sophisticated natural history models ever, have all been used to provide an unparalleled glimpse into a world that few of us would ever expect to see.

For the first time ever, we can follow the embryonic journey of four different animals: our kangaroo, the lemon shark, the Emperor penguin, and the parasitic wasp. And one of the most jaw-dropping sequences is a glimpse of the joey just before he is born - a mass of kicking legs and punching arms, raring to go.