BBC Earth

There are not five separate oceans, but one. Its waters linked by powerful forces that keep them on the move. This constant mixing is vital for the health of oceans and marine life.

Steve Backshall is in the Middle Eastern nation of Oman, in search of some of the brainiest, most intelligent hunters our planet has ever seen, as well as a shark species we have never seen before.

Steve Backshall is in the urban jungle in Chile looking for animals that thrive downtown. Chile is boarded on the west by the pacific ocean. Sea birds and sea lions thrive close to the shore.

Griff Rhys Jones journey heads down New Zealand's back roads sees him travel from Auckland to the Coromandel, on to Taupo and finally Wellington.

In the final leg, Palin enters Zulia's dangerous border region, exploring struggling communities while seeking the Catatumbo lightning and witnessing resilience, culture and hardship.

Actress Lena Headey joins Bear on a 48-hour expedition through the steep cliffs and icy waters of Spain's Iberian Peninsula. Can she handle the punishing conditions?

Steve Backshall is in the Middle Eastern nation of Oman, in search of some of the brainiest, most intelligent hunters our planet has ever seen, as well as a shark species we have never seen before.

Steve Backshall is in the urban jungle in Chile looking for animals that thrive downtown. Chile is boarded on the west by the pacific ocean. Sea birds and sea lions thrive close to the shore.

Tour a building that once fuelled the Victorian era but is now a busy retail complex, then eye a Viennese gasometer that has become a shining example of communal living.

Dropped amidst snow capped mountains, Uzo and Bear move quickly as a storm sets in, sending hail, lightning and flash floods their way.

How did the ostrich get the world's largest egg? Chris Packham explores how the drive to reproduce has shaped life. From the first sex to the origin of eggs, feathers, and flight.

Ryan continues the mammoth trek that began in Liechtenstein, meeting a fascinating collection of characters along their path, as they draw ever closer to their goal of arriving in Montreux.

A weak emperor. A divided empire. Barbarians at the gate. Does this perfect storm mean the end of ancient Rome?

Dropped amidst snow capped mountains, Uzo and Bear move quickly as a storm sets in, sending hail, lightning and flash floods their way.

How did the ostrich get the world's largest egg? Chris Packham explores how the drive to reproduce has shaped life. From the first sex to the origin of eggs, feathers, and flight.

A weak emperor. A divided empire. Barbarians at the gate. Does this perfect storm mean the end of ancient Rome?

Dropped amidst snow capped mountains, Uzo and Bear move quickly as a storm sets in, sending hail, lightning and flash floods their way.

How did the ostrich get the world's largest egg? Chris Packham explores how the drive to reproduce has shaped life. From the first sex to the origin of eggs, feathers, and flight.

In the final leg, Palin enters Zulia's dangerous border region, exploring struggling communities while seeking the Catatumbo lightning and witnessing resilience, culture and hardship.

Ryan continues the mammoth trek that began in Liechtenstein, meeting a fascinating collection of characters along their path, as they draw ever closer to their goal of arriving in Montreux.

Steve Backshall is in the Middle Eastern nation of Oman, in search of some of the brainiest, most intelligent hunters our planet has ever seen, as well as a shark species we have never seen before.

Steve Backshall is in the urban jungle in Chile looking for animals that thrive downtown. Chile is boarded on the west by the pacific ocean. Sea birds and sea lions thrive close to the shore.

How did the ostrich get the world's largest egg? Chris Packham explores how the drive to reproduce has shaped life. From the first sex to the origin of eggs, feathers, and flight.