BBC Earth på tisdag – Tv-tablå 27 oktober

As one of the world's most in-demand sporting coaches, 43-year-old Nikola Boric once travelled the world, welcomed everywhere he went. Now, he lives in a wooden cabin without electricity, water or heating.

David Attenborough examines the narwhal's tusk and the spiral shells found on snails.

In Dumfries and Galloway, Nick and Holly are taking on a new venture to help secure their future on the farm. On Papa Westray, Paul's learning to shear and it's the Papay fun weekend, a highlight of the island community calendar.

On Papay, Paul and Mel juggle farm work with wedding prep, while Sally's ewes in Caithness have been struck by a mystery illness. Jo and Andy turn lambs into much-needed cash.

From deep in the undergrowth to the highest tree, forests are home to two-thirds of all mammal species. Discover how they overcome the many challenges of life in a crowded world.

Jason Fox - Foxy from SAS: Who Dares Wins - takes Maya Jama out of her comfort zone for scary physical challenges and some heart-to-heart chat.

How did a small island create the biggest empire the world has ever seen? David Olusoga uncovers a living legacy.

The chilling discovery of 30 massacred bodies on a Swedish Island reveals an ancient Nordic murder mystery - the story of how a warrior tribe was brutally murdered by their rivals.

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

Ben meets a photographer living out his childhood dream. Dan Price gave up his job as a photographer to live the remotest of lifestyles in a meadow in Oregon, USA.

In the Peak District National Park, Bill and Alan Davies take the Monsal Trail to Derbyshire's highest pub, Abney Moor and Mam Tor, and chat about the perils of ageing and the stresses of modern life.

Four rival families - leopards, hyena, wild dogs and lions - all try to claim a rich corner of Zambian paradise as their home. Who will succeed in ruling this precious kingdom?

How did a small island create the biggest empire the world has ever seen? David Olusoga uncovers a living legacy.

The Hailstones work to repair a vital piece of equipment for their hunting grounds. Sue Aikens contends with the dangers of the tundra while hunting for small game.

Ben heads to a remote corner of Spain's Andalucían mountains to meet British couple Alan and Lorna, who have left their respective careers in Brighton to become alpaca farmers.

History gets personal as historian David Olusoga uncovers how British imperial history is family history.

Dara tells the story of how the first photograph of the far side of the moon left scientists baffled. And he tries a virtual reality headset to takes his very own giant leap on the 'moon's' surface.

More stories of the brave and hardy people who live below zero in Northern Canada.

The Hailstones work to repair a vital piece of equipment for their hunting grounds. Sue Aikens contends with the dangers of the tundra while hunting for small game.

Ben heads to a remote corner of Spain's Andalucían mountains to meet British couple Alan and Lorna, who have left their respective careers in Brighton to become alpaca farmers.

History gets personal as historian David Olusoga uncovers how British imperial history is family history.

Dara tells the story of how the first photograph of the far side of the moon left scientists baffled. And he tries a virtual reality headset to takes his very own giant leap on the 'moon's' surface.