BBC Earth

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.

Deep in the heart of the Sahara desert in Morocco, Ben visits a mud brick oasis, where he meets British-born Karen, who has built a guest house and artists' retreat in this inhospitable location.

In Boquete, Ben joins Andi and Rick and their son Cole, from Oregon, USA. He learns why they left their comfortable lives in the States behind to develop a unique coffee plantation.

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

Noah, Bethany and Ally pull out the stops at their local show, Lucy and Adam have a new baby and a new business plan, and Callum receives a surprise award.

Why do some animals switch their traditional sexual identities?

Uncovering the mystery of where some animals disappear to each year.

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.

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.

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.

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

David Attenborough examines the chameleon's tongue and the giraffe's neck.

A behind-the-scenes look at the series that explores the most successful animal group on Earth, from the tiny Etruscan shrew to the largest mammal in existence - the blue whale.

Sue Perkins enjoys a night out with Kyoto's geishas, goes free diving with some ama divers and visits Hiroshima. In Tokyo, she explores how the Japanese are tackling the future.

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

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.

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

Ben Fogle returns to Sweden to visit Annalisa, an Italian living in the deep woods with her young son Nico.

Fitness fanatic Jonathan requires pioneering robotic surgery for a rare melanoma. And ex-postie Dave, who's 66, needs a massive vascular tumour removed.

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.

In Germany, floods tear through central European towns and villages. In Nepal a landslide threatens local communities. In California, wildfires tear through the states forests and farms.

Sue Perkins enjoys a night out with Kyoto's geishas, goes free diving with some ama divers and visits Hiroshima. In Tokyo, she explores how the Japanese are tackling the future.

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

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

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