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Channel 4 Thursday 21 December 9pm
The largest land mammal, the elephant, takes 22 months to grow from a single microscopic egg into a 100-kilogramme baby. And yet the dog is able to produce a complete litter of puppies in two months.
New visual insights into the development of dolphin embryos reveal an evolutionary clue supporting the theory that these aquatic mammals may once have lived on land.
This is the extraordinary world of the womb...
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 Dog embryo at 30 days
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 Dolphin embryo at one month
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 Elephant embryo at 11 weeks
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 Dog foetus nearly full-term
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 Dolphin in the womb
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 Dog in the womb
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 Elephant in the womb
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