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.

Vast forests and high ridges in Romania's Carpathian Mountains host Europe's largest population of brown bears; we follow conservationists as they rewild bison, reforest and survey bear populations.

Gary, Shannon, Callie and Damon try to catch a ten-foot alligator in a muddy mess, and there is one big problem near a local golf course when a gator gets stuck near a busy street.

Gary, Arlie and Jake search for a gator in an RV park, Shannon finds a timber rattlesnake at a local business, and the team trade gators with their sister park in South Padre Island, Texas.

An insightful and spectacular celebration of birds of prey, our planet's most successful hunters; from frozen wilderness to tangled jungle, this episode reveals the raptors as never before.

A power outage in Kavik leaves Sue Aikens scrambling to restore her communications, while Glenn Villeneuve sets out on his most crucial hunt of the year.

Vast forests and high ridges in Romania's Carpathian Mountains host Europe's largest population of brown bears; we follow conservationists as they rewild bison, reforest and survey bear populations.

Cold hearts beat with a raging hot fury in a frozen world of snow, icy waters and extreme wind chill; from snow leopards to polar bears, these fighters battle it out with each other.

A power outage in Kavik leaves Sue Aikens scrambling to restore her communications, while Glenn Villeneuve sets out on his most crucial hunt of the year.

Two devastating earthquakes hit Mexico in quick succession, and an Aussie storm chaser becomes trapped in the middle of the most powerful tornado ever recorded in El Reno, Oklahoma.

Jeremy travels to Papua New Guinea to investigate a spate of bizarre deaths on the Sepik River; he is on the trail of a creature that has been tearing chunks out of fishermen.

A power outage in Kavik leaves Sue Aikens scrambling to restore her communications, while Glenn Villeneuve sets out on his most crucial hunt of the year.

Autumn is a season of change, migration and frantic activity in the natural world; as days shorten, animals who travel must prepare for the journey while those that stay must build up food reserves.

An insightful and spectacular celebration of birds of prey, our planet's most successful hunters; from frozen wilderness to tangled jungle, this episode reveals the raptors as never before.

Disgorging more water than the next nine biggest rivers combined, the Amazon is the mightiest of all. Jeremy discovers issues putting the river at risk by tracing the migration of the dorado catfish.

Winter planning begins to fall apart for Alaskans as they prepare for the impending freeze.

In this episode we look at why humans and nature need the dark. We leave Budapest in the Magic Hour. As the sun rises over the mountains of Switzerland, we learn about the formation of the Alps.

Cold hearts beat with a raging hot fury in a frozen world of snow, icy waters and extreme wind chill; from snow leopards to polar bears, these fighters battle it out with each other.

Winter planning begins to fall apart for Alaskans as they prepare for the impending freeze.

Two devastating earthquakes hit Mexico in quick succession, and an Aussie storm chaser becomes trapped in the middle of the most powerful tornado ever recorded in El Reno, Oklahoma.

Disgorging more water than the next nine biggest rivers combined, the Amazon is the mightiest of all. Jeremy discovers issues putting the river at risk by tracing the migration of the dorado catfish.

Autumn is a season of change, migration and frantic activity in the natural world; as days shorten, animals who travel must prepare for the journey while those that stay must build up food reserves.