The hunt for the largest snow leopard, 'The Dude', heats up. With each revelation, Dan and his team grapple with the complexities of snow leopard behaviour.

Heatwave Lucifer burns though Europe, triggering some of the worst wildfires in Portugal's history, while a Mojave mudslide traps motorists in a raging torrent of sludge.

The Yangtze, the biggest river in Asia, was once home to rare aquatic mammals and prodigious quantities of fish. Jeremy passes by Shanghai, the huge Three Gorges Dam, and the uplands of Yunnan.

A new intern is tasked with helping the team remove a gator from a 20-foot-deep well, and Callie and Shannon rescue a gator hanging out near a movie theatre.

Meet Kenya's Marsh Pride in the Maasai Mara. As power shifts within the lions, rising human conflict and habitat loss threaten their fight to survive.

America's mighty Mississippi is under threat from alien invaders, toxic run-off, and massive man-made disruptions. Jeremy meets spirited Americans who want to fix the river's problems.

With winter losing its grip, Alaskans take on new projects and develop new skills for their survival. They travel to build shelter, gather important firewood, and harvest new food sources.

Tropical diseases such as dengue fever, malaria, chikungunya and West Nile virus were long considered a distant problem. But now they have arrived in Europe. How great is the danger on our doorstep?

The end of the wet season approaches, and things look better for the Waterfront pride. But other pressures arise. Einstein attempts courtship, while rival Mad-Eye-Moody still holds Keeza captive.

With winter losing its grip, Alaskans take on new projects and develop new skills for their survival. They travel to build shelter, gather important firewood, and harvest new food sources.

A record breaking twister rips through the city of Tuscaloosa. A couple of students have a terrifying close encounter and the city hospital is swamped by hundreds of casualties.

America's mighty Mississippi is under threat from alien invaders, toxic run-off, and massive man-made disruptions. Jeremy meets spirited Americans who want to fix the river's problems.

With winter losing its grip, Alaskans take on new projects and develop new skills for their survival. They travel to build shelter, gather important firewood, and harvest new food sources.

Tropical diseases such as dengue fever, malaria, chikungunya and West Nile virus were long considered a distant problem. But now they have arrived in Europe. How great is the danger on our doorstep?

Meet Kenya's Marsh Pride in the Maasai Mara. As power shifts within the lions, rising human conflict and habitat loss threaten their fight to survive.

Wild and un-navigable, Africa's iconic Zambezi boasts the world's mightiest waterfall, heart-pounding rapids, and man-eating crocs. Jeremy investigates why this great river is in trouble.

As winter approaches, the Hailstone family receive news of some land they have inherited. Meanwhile, after being stranded for days, Glenn attempts to return to his remote cabin.

In a river ecosystem in Northern Portugal, we follow Eurasian otter, Kiko, from his first explorations outside his family to his independence as a guardian of his territory.

The end of the wet season approaches, and things look better for the Waterfront pride. But other pressures arise. Einstein attempts courtship, while rival Mad-Eye-Moody still holds Keeza captive.

As winter approaches, the Hailstone family receive news of some land they have inherited. Meanwhile, after being stranded for days, Glenn attempts to return to his remote cabin.

A record breaking twister rips through the city of Tuscaloosa. A couple of students have a terrifying close encounter and the city hospital is swamped by hundreds of casualties.

Wild and un-navigable, Africa's iconic Zambezi boasts the world's mightiest waterfall, heart-pounding rapids, and man-eating crocs. Jeremy investigates why this great river is in trouble.

Tropical diseases such as dengue fever, malaria, chikungunya and West Nile virus were long considered a distant problem. But now they have arrived in Europe. How great is the danger on our doorstep?