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BBC Northern Ireland region started on 19th April 1955 as part of the BBC Television Service, before becoming BBC One Northern Ireland.

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Simulcast of network BBC One in high definition. From 03/11/2010

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The BBC West region started on 1st September 1957 as part of the BBC Television Service, before becoming BBC One West.

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Until 03/01/2009 BBC Two Wales (analogue) was known simply as BBC Two Wales. BBC Two Wales (digital) was BBC 2W. From 03/01/2009 BBC Two Wales schedules on both analogue and digital became identical

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Formerly part of a wider BBC One South East region. Separated as BBC One London 2001-09-03 following reorganisation of the South East region.

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Frozen Planet: Episode 2: Spring

Documentaries

Spring

Episode 2

Episode 2: Spring

BBC One - Frozen Planet, Spring

Spring arrives in the polar regions, and the sun appears after an absence of five months.

Documentary series. It's spring in the polar regions and, after a five-month absence, the sun reappears. The greatest seasonal transformation on our planet is under way.

Spring arrives in the polar regions, and the sun appears after an absence of five months; warmth and life return to these magical ice worlds - the greatest seasonal transformation on our planet is under way.

Male adelie penguins arrive in Antarctica to build their nests - it takes a good property to attract the best mates and the males will stop at nothing to better their rivals. But these early birds face the fiercest storms on the planet.

In the Arctic, a polar bear mother is hunting with her cubs. Inland, the frozen rivers start to break up and billions of tons of ice are swept downstream in the greatest of polar spectacles. This meltwater fertilizes the Arctic Ocean, feeding vast shoals of Arctic cod and narwhal. The influx of freshwater accelerates the breakup of the sea ice - an area of ice the size of Australia will soon vanish from the Arctic.

On land, a woolly bear caterpillar emerges from the snow having spent the winter frozen solid. Caterpillars normally become moths within months of hatching, but life is so harsh here that the woolly bear takes 14 years to reach adulthood. Once mature, it has only days to find a mate before it dies. Alongside the caterpillars, white arctic wolves race to raise their adorable cubs before the cold returns.

In Antarctica, vast numbers of seabirds arrive on South Georgia joining the giant albatross and king penguins that have been there all winter. Elephant seals fight furious battles over females on a beach that contains the greatest mass of animals on the planet.

Finally, the female adelie penguins arrive, chased from the water by killer whales. Mating and chick rearing lie ahead of them.

BBC One

Factual: Science & Nature: Nature & Environment

The ultimate portrait of the Polar regions - the last great wildernesses on the planet.

David Attenborough travels to the end of the earth, taking viewers on an extraordinary journey across the polar regions of our planet.

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