Graeme Duane

It begins at the end: Tau is dying; a slow shutting-down creeps over his body. Its time to reflect. His life is over but it was well spent.

The Amazon is one of the wildest and least explored parts of the planet. Encompassing 6 countries and 2 million square miles of forest, river and floodplain, it has the highest diversity of life on the planet, but what lies below it is truly shocking. In its deep muddy rivers, clear streams and expansive floodplains a freak-show of fish life has exploded, with some of the strangest shapes and weirdest adaptations on Earth. Hiding in the vast rivers and streams is an electric grid, a bizarre community of fish with a highly sophisticated electric sixth sense. Using electricity, these "Super" fish can communicate wirelessly, control each other remotely and emit shocks that can stop a human heart. This cryptic world has mystified scientists throughout the ages. Now an intrepid scientist, Will Crampton ventures back into the dark jungles where the inspiration for our technology driven world first emerged, in an attempt to unravel their secrets and unlock the electric code.

A routine drone survey turns deadly when Ryan Johnson, a marine biologist based in South Africa, films a humpback whale being attacked and strategically drowned by a Great white shark. This is a total perspective shift for the creature.

Lions and buffalo battle for survival on the African grassland.

In the African wilderness, there's no such thing as a free lunch. It's a world where predator and prey are equally matched. And a worthwhile meal means going up against gut-gouging horns, venomous fangs, stampeding hooves, and sharp canines. Take a front row seat and witness the bouts of lion vs. Cape buffalo, mongoose vs. mamba snake, leopard vs. baboon, and other wild clashes. Here, the odds of success are just 50/50, but in the age-old contest between hunter and hunted, the reward is well worth the risk.

There is an island where dragons still roam. A Jurassic type underworld where ancient warlords still rule. Where they fight for supremacy...where they fight to survive. Komodo Island - deep in the remote basin of the Pacific Ocean - its an ancient Kingdom of fire and brimstone. Here, a string of 452 volcanoes erupt from the ocean bed, its known as "The Ring of Fire" and it's the perfect habitat for dragons. Komodo Dragons! The largest living lizard on the planet with 34 million years of survival in his DNA. Its no surprise that he's still known as a dragon, he has the presence of an ancient gladiator. He's armored in claws and scales, but instead of spitting fire, he spits deadly venom.

A high-tech autopsy on a Nile crocodile unlocks secrets behind its hunting prowess.