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The Life of Mammals

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David Attenborough

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The Life of Mammals: Episode 7: Return to the Water

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Factual: Science & Nature

Factual: Science & Nature: Nature & Environment

Return to the Water

Episode 7

Episode 7: Return to the Water

BBC One - The Life of Mammals, Return to the Water

David Attenborough looks at marine mammals that have returned to the sea.

David Attenborough continues his major documentary series with a look at marine mammals that have returned to the sea - from sea otters to the blue whale.

From the roughest seas to the crystal clear waters of the Florida springs, David Attenborough swims with sea otters and dives with manatees, as he follows those mammals who, millions of years ago, left dry land and returned to the water to feed. 

Attenborough races across the Pacific Ocean to find the largest mammal that has ever lived on this planet, the blue whale. As David says, 'nothing like that can grow on land because no bone is strong enough to support such bulk. Only in the sea can you get such huge size as this magnificent creature'. He also bounces through the waves off New Zealand to witness an enormous pod of high-speed dolphins pursuing their fish dinner.

Although some marine mammals like seals and sea lions still come ashore to breed, all porpoises, dolphins and whales have evolved to court, mate and give birth in the water. Indeed the sight of humpback whales mating is truly amazing, with the males wielding the longest penis in the animal kingdom - 12 feet long - and so highly mobile that it can seek out the female genital opening as she swims alongside.

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David Attenborough looks at why mammals are the most successful creatures on the planet.

David Attenborough presents a nature documentary series looking at why mammals are the most successful creatures on the planet.

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Episode 7: Return to the Water

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