Bob Poole

Over the last three decades, science has been advancing our understanding of stress: how it impacts our bodies and how our social standing can make us more or less susceptible. From baboon troops on the plains of Africa, to neuroscience labs at Stanford University, scientists are revealing just how lethal stress can be. Research tells us that the impact of stress can be found deep within us, shrinking our brains, adding fat to our bellies, even unraveling our chromosomes. Understanding how stress works can help us figure out ways to combat it and how to live a life free of the tyranny of this contemporary plague. In Stress: Portrait of a Killer, scientific discoveries in the field and in the lab prove that stress is not just a state of mind, but something measurable and dangerous.

A wildlife filmmaker tries to keep up with a Cheetah mom determined to keep her cubs alive.

In the heart of Gorongosa National Park, Mozambique, the waters of Lake Urema explode with the thrashing of a giant crocodile tail. Gorongosa was once known as the place where Noah left his ark: 1,500 square miles of lush floodplains in central Mozambique, packed with wild animals. All around, enormous buffalo, soaring fish eagles, and countless antelopes roam freely. But on closer look, something strange is going on. Fifteen years of civil war has taken a heavy toll and many species have been almost completely wiped out. All the usual top predators and prey are virtually missing, except for one - giant crocodiles and thousands of them. Discover what is being done to bring this African oasis back to its former glory, including perhaps the most ambitious restoration effort ever attempted, with elephants, hippos and scores of zebra, wildebeest, impala and buffalo, being relocated into the park.

A Giraffe mother tells the story of three young gazelle fawns who have to experience great adventures on the plains of Africa.

South Florida is the only place on Earth that is home to both the American alligator and the American crocodile (and most recently, the Nile crocodile). But who is the baddest Florida predator?

Join narrator Patrick Stewart on a sweeping journey through Earth's fascinating history -- from the formation of ancient, geological artifacts to the modern exploration of the moon. The film is a storehouse of facts you probably didn't know. For instance, more than 18,000 meteorites strike Earth each year; it's 3,000 degrees four miles below Earth's surface; and Mount Everest's peak was once part of the ocean floor.

Successful lions need to be brutal and use any means to quash would-be kings. These are not random acts of violence, but vital behaviour to secure their own genetic future.

It delivers enough venom in one bite to kill a hundred people, yet it solely preys on other snakes. Through rare footage follow the King Cobra on its journey throughout the rainforests of India seeking food and a mate.