In Our Time: The Fish-Tetrapod TransitionSeries 1, episode 0Melvyn Bragg and guests discuss one of the greatest changes in the history of life on Earth. Around 400 million years ago some of man's ancestors, the fish, started to become a little more like humans. At the swampy margins between land and water, some fish were turning their fins into limbs, their swim bladders into lungs and developed necks and eventually they became tetrapods, the group to which all animals with backbones and limbs belong. With that development came an explosion in the diversity of life on Earth Click to see when In Our Time, The Fish-Tetrapod Transition is coming up on UK TV Cast (unconfirmed)
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