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The adventurers compete in a punishing race up a mountain in the shadow of Everest.
In southern Ethiopia, the lads take on the deadly sport of Suri stick-fighting.
In Burkina Faso, the contestants take part in a brutal inter-village wrestling contest.
The lads are in a very rainy central Brazil to race canoes against the Wauja tribe.
The life story of Titus - a silverback living in Rwanda's Virunga Mountains.
Two-part special in which Horizon considers where the line between sanity and madness lies
The athletes are in Bhutan to learn the national sport of archery.
The marine experts carry out pioneering science on the 20-metre-long sperm whale.
Mark Meakin attempts to unravel the mysterious wanderings of the biggest fish in the sea.
The athletes are in Kamchatka in Asia to take on Koriyak nomads in an endurance race.
Second part of the documentary considering where the line between sanity and madness lies.
The team meets a lady who cannot understand why she never sees butterflies anymore.
Why are parts of the Southern Ocean warming twice as fast as the rest of Earth's oceans?
David Attenborough discovers some surprisingly human behaviour when he looks at monkeys.
How thousands of strange nocturnal birds make their home on the tiny island of Bardsey.
Jimmy Doherty is on a mission to find out if GM crops really can feed the world.
The athletes take on the sport of sikaran, a brutal form of kick-fighting.
Jonathan starts this journey in a mine and then makes his way down to Ekaterinburg.
A look at bird life off the coast of Alaska lies a tiny volcanic island.