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.

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

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.

Song Ji-hyo continues on the greatest challenge of her life: free diving with the legendary Haenyeo female underwater sea fishers.

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.

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.

Humans are changing our planet so rapidly, it's affecting earth's life support systems: our weather, our oceans and the living world.

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.

Song Ji-hyo continues on the greatest challenge of her life: free diving with the legendary Haenyeo female underwater sea fishers.

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.

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.

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.

Actress Keri Russell joins Bear on an epic journey to the Canary Islands off the coast of Africa. After battling the dangerous, rolling rocks of a massive volcano, the duo descend into a canyon.

Cameras in space show that Earth is changing rapidly. Cities sprawl while forests and glaciers shrink. But in Tanzania locals have regenerated the landscape to save chimpanzees.

Joanna returns to her birthplace, India, in search of a kitchen cupboard staple once known as 'black gold'. Starting in the majestic ancient city of Hampi, she's invited to a dazzling Hindu festival.

Reza sets off on a quest to be the first to capture the mysterious Dugongs of Bahrain on camera.

Actress Keri Russell joins Bear on an epic journey to the Canary Islands off the coast of Africa. After battling the dangerous, rolling rocks of a massive volcano, the duo descend into a canyon.

Cameras in space show that Earth is changing rapidly. Cities sprawl while forests and glaciers shrink. But in Tanzania locals have regenerated the landscape to save chimpanzees.

Reza sets off on a quest to be the first to capture the mysterious Dugongs of Bahrain on camera.

Actress Keri Russell joins Bear on an epic journey to the Canary Islands off the coast of Africa. After battling the dangerous, rolling rocks of a massive volcano, the duo descend into a canyon.

Cameras in space show that Earth is changing rapidly. Cities sprawl while forests and glaciers shrink. But in Tanzania locals have regenerated the landscape to save chimpanzees.

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.

Reza sets off on a quest to be the first to capture the mysterious Dugongs of Bahrain on camera.

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.

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.