Tropical rainforests are the most diverse ecosystems on the planet; that means intense competition. Crocodiles in the mangrove forests of Borneo are drawn to the rich variety of species on offer.

The cool season ends, and savanna gliders explore the canopies of the savanna. The growing heat of Wilbooroo dries the wetlands, and forces crocs into overcrowded rivers, sparking territorial fights.

About 10% of the world's population lives near one of Earth's roughly 1,500 active volcanoes. In France's overseas territories, observatories watch volcanic activity to protect local populations.

Hurricane Harvey rips a coastal town apart and dumps a once-in-a-thousand-years rainfall that drowns Houston.

From rivers to oceans, water wars rewrite the rules of conflict; gravity has no meaning underwater. Weird and wonderful creatures of the reef terrorise each other as they battle for an inch of space.

A disturbing report from Cambodia of something in the water that's sliced cleanly through a young man's testicle sends Jeremy on a quest to expose an unseen mutilator.

Spring is coming, and in Kiwalik, the Hailstones go on a hunt for caribou before the region thaws completely and they are unable to cross the river.

The cool season ends, and savanna gliders explore the canopies of the savanna. The growing heat of Wilbooroo dries the wetlands, and forces crocs into overcrowded rivers, sparking territorial fights.

About 10% of the world's population lives near one of Earth's roughly 1,500 active volcanoes. In France's overseas territories, observatories watch volcanic activity to protect local populations.

Spring is coming, and in Kiwalik, the Hailstones go on a hunt for caribou before the region thaws completely and they are unable to cross the river.

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.

A disturbing report from Cambodia of something in the water that's sliced cleanly through a young man's testicle sends Jeremy on a quest to expose an unseen mutilator.

Spring is coming, and in Kiwalik, the Hailstones go on a hunt for caribou before the region thaws completely and they are unable to cross the river.

The cool season ends, and savanna gliders explore the canopies of the savanna. The growing heat of Wilbooroo dries the wetlands, and forces crocs into overcrowded rivers, sparking territorial fights.

From rivers to oceans, water wars rewrite the rules of conflict; gravity has no meaning underwater. Weird and wonderful creatures of the reef terrorise each other as they battle for an inch of space.

A disturbing report from Cambodia of something in the water that's sliced cleanly through a young man's testicle sends Jeremy on a quest to expose an unseen mutilator.

As the rivers melt and waters rise across the Arctic, Alaskans try to stay ahead of the changing landscape.

Isolated since the time of the dinosaurs, New Zealand's wildlife has been left to its own devices and its forests are stalked by predators from the Jurassic era.

Yellowstone is one of the most powerful supervolcanoes on Earth; what would the consequences if it erupted? Leading experts show us the different possible scenarios of a Yellowstone super eruption.

As the rivers melt and waters rise across the Arctic, Alaskans try to stay ahead of the changing landscape.

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.

A disturbing report from Cambodia of something in the water that's sliced cleanly through a young man's testicle sends Jeremy on a quest to expose an unseen mutilator.