På BBC Earth lørdag 5. september

Ben returns to New Zealand to catch up with the Long family, who live a hunter-gatherer existence on the country's South Island in an area that is two days hike from the nearest road. So how have the children coped with such an isolated upbringing, and how have the parents maintained their relationship?

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Ben returns to New Zealand to catch up with the Long family, who live a hunter-gatherer existence on the country's South Island in an area that is two days hike from the nearest road. So how have the children coped with such an isolated upbringing, and how have the parents maintained their relationship?

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Endringer i landskapet og dyrenes vaner truer alaskernes tilværelse. Familien Hailstone begynner å bli desperate når de ikke finner en kilde som tidligere ga rikelig med mat.

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Steve heads into the heart of the Suriname Jungle. He goes in search of poison dart frogs, deadly snakes and hopes to find the elusive giant river otter.

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Chip's life grounds to a halt when his snow machine breaks - meaning no hunting, no fishing and, most importantly, no trade.

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David presents animal species whose seasonal (dis)appearing has puzzled men for centuries. First geese and other migratory birds, which were long supposed to 'hibernate' in bizarre ways, a matter of dispute centuries even after emperor-falconer Frederic Hohenstaufen wrote down the actual fact. Next butterflies, who were believed 'sponteously generated' until people realized they are the adult form of utterly dissimilar caterpillars.

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Michael Portillo embarks on a Greek odyssey from Athens's port of Piraeus north to the city of Thessaloniki, where Greece's King George I was assassinated in 1913.

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Michael Portillo ventures deep into the Black Forest on a quest to discover the essence of Germany, and discovers how Hansel and Gretel helped to unify the nation.

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Michael Portillo returns to Spain to trace the early 20th-century roots of the Spanish Civil War, which divided his Spanish family and sent his father into exile. He discovers a nation fractured at the time. 6/6

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The struggle for survival in Alaska continues for Sue, Jessie, Glenn and the Hailstones.

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Vi tar en titt på naturens rariteter, deriblant et dyr med superlang hals og et annet med elastisk tunge.

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The Great British Intelligence Test measures the brainpower of the nation in one of the largest intelligence experiments of its kind.

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Many passionate people are dedicated to saving the wild animals of Asia. These individuals and their ingenious solutions give us hope and optimism for the future of the continent.

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In the depths of winter, the off-grid Alaskans work tirelessly to combat the deep cold.

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Fitness fanatic Jonathan requires pioneering robotic surgery for a rare melanoma. And ex-postie Dave needs a vascular tumour removed from around his left kidney.

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Christine's sister Catherine gets to grips with Arctic life when she visits from England. Meanwhile, snowmobile guide Alex attempts to take his girlfriend Karolina on a romantic trip.

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The Great British Intelligence Test measures the brainpower of the nation in one of the largest intelligence experiments of its kind.

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See how CGI imagery, the latest scientific research and archive footage created the series. In this episode: looking at the sun.

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In the depths of winter, the off-grid Alaskans work tirelessly to combat the deep cold.

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