As the ocean's hunters prowl the seas, each masters its own way of survival. Their strategies differ, but the same rules apply: Assess, adapt, act.

We take in New Zealand's natural beauty from Fiordland - the home of the Hobbits - to Cape Reinga, the northern tip where wild horses run along lonely sandy beaches.

The San Andreas Fault is the junction point of two tectonic plates stretching across San Francisco and Los Angeles; it is 1,300km long and currently the most surveyed phenomenon in the world.

A bomb cyclone detonates across northeast America, snaring an elderly Michigan couple in a mass freeway pile-up. A hiker loses her nerve high on Ben Nevis.

North America's Pacific coast sits on a very active stretch of Earth's crust, where slowly moving tectonic plates help create a long chain of volcanoes of nearly 10,000km.

Europe sits on active tectonic zones, from Iceland to Italy. Ancient volcanoes under its cities and coasts still pose risks that could affect Europe and beyond.

The Pacific Ring of Fire circles the Pacific Ocean. Its volcanoes create new land and habitats, but they can also collapse or erupt and destroy them.

Southeast Asia has many active volcanoes. They have caused major eruptions, tsunamis, city damage, and climate effects, and millions of people live nearby.

The San Andreas Fault is the junction point of two tectonic plates stretching across San Francisco and Los Angeles; it is 1,300km long and currently the most surveyed phenomenon in the world.

Alaskans must take advantage of the long days to prepare for the long freeze that lies ahead. In Kiwalik, the Hailstones embark on a seasonal native harvest, hunting for seagull eggs along the river.

Alaskans must ensure they are prepared to withstand the extreme cold that lies ahead when winter arrives.

As the thaw draws to a close, Alaskans battle the clock to maximize their final days of sunlight in the Arctic.

To prepare for winter in the Arctic, the Alaskans must overcome challenges as they travel through unfamiliar territories. They must take advantage of the fall season by stockpiling resources.

To ensure their survival for the upcoming winter, Alaskans must head out into the fray. From scouting for resources in sub-zero temperatures to hiking the countryside in search of food.

Vet Bridget is called out to a prolapsed sheep on a hill farm, Guy tries to resolve border collie Riley's swollen face, and David must deal with a cat who faces dental surgery.

William treats a lamb with a suspected broken leg, Tom has a 900kg Clydesdale to treat, Guy helps Silence the corn snake, and Shondie needs to complete dental work on Ola the Westie.

From the largest lemur to the song of the humpback whale, Sir David Attenborough chooses his favourite recordings from the natural world that have revolutionised our understanding of song.

How is an egg made, why are they the shape they are, and why lay an egg at all? Piece by piece, from creation to hatching, Sir David Attenborough reveals the wonder behind these miracles of nature.

Shark experts Dr Riley Elliott and Kori Burkhardt uncover which male great white shark reigns as the alpha in the pack by testing the sharks' speed, hunting prowess, and fearlessness.

In South Australia, rumours persist of 18-foot mega sharks lurking in the depths. Dr. Lauren Meyer, a white shark expert, and Colin Thrupp, an underwater cinematographer aim to track them down.

The mighty white shark is no longer sitting atop the food chain. Recent gruesome orca attacks crown the orca as king of the ocean. What would it take for sharks to fight back?

We explore the planet's fiercest alpine arenas. Bobcats hunt through snowbound forests, red foxes track mice under ice, and snow leopards risk fatal falls in Himalayan chases.

We cross continents to reveal the world's most dramatic survival arenas. From lionesses hunting zebra to dingoes clashing with echidnas, every grassland teems with rivalry and risk.