Brady Barr embarks on a mission to better understand the odd-looking smalltooth sawfish.

After several villagers are killed by man-eating crocodiles, Brady trains a team of local rangers to capture crocs for relocation.

Brady and his team try new methods of catching the strong, fast and semi-aquatic animals, one of Africa's biggest wildlife management challenges.

Brady uses a robot that is disguised as a jackal to lure a python; Brady attempts to use a robot to capture a 9-foot mamba snake.

The unique features of bites from tiger sharks, bull sharks and great white sharks.

Brady travels to the heart of the Central Suriname Nature Preserve with Dr Crampton; they search for the incredibly dangerous electric eel.

Dr. Brady Barr collaborates with researchers to capture unharmed a huge Humboldt squid, which can grow up to six feet long.

Brady tries to establish the wildest animal in America's west.

Brady Barr embarks on a mission to better understand the sawfish.

Brady rates four salamanders based on size, survival skills, sliminess and toxicity to determine the king of all salamanders.

Brady develops a reinforced, life-size hippo decoy to protect himself as he gets close to Nile hippos in a quest to better understand the animals.

Brady seeks the electric eel in the heart of the Surinamese rainforest.

Brady uses a range of hands-on tests to discover how the Komodo dragon is able to take down animals 10 times its own weight.

Brady treks through the heart of Africa's Congo Basin in search of a mysterious beast that local tribes refer to as "the one who stops the flow of rivers."

The sixgill shark, one of the oldest carnivorous species on earth, has remained elusive despite the creature's massive size.

A python repeatedly bites Barr and wraps him in its powerful coils when he tries to capture it for further study.

Brady works to create a unique, protective crocodile-suit to allow him to get close to wild Nile crocodiles without having to restrain them.

Brady investigates brown bears and polar bears in the Alaskan rainforest and Canada's Hudson Bay.

Australian host Steve Irwin and his wife Terri run a wildlife refuge. Their shared passion is educating the world about wildlife, including the much feared crocodile and numerous venomous snakes. Steve's speciality is the capture and relocation of crocodiles. No animal appears too threatening to Steve, his true respect for animals is the foundation for everything he does.

Adventurer/survivalist Bear Grylls hosts and narrates this six-part docuseries, which draws attention to the volatility of Mother Nature and the resilient animals that survive Earth's most extreme habitats. Each hourlong episode characterizes one of the planet's roughest environments -- including jungles, mountains, deserts, oceans, the poles and grasslands -- and how each of its inhabitants acclimate to its turn of events. As Grylls guides viewers through these extreme locations, the incredible ways in which animals have adapted to survive against all odds are celebrated. As well, underscored is a sense of urgency to the effects of climate change.

If it's weird, true and freaky and it involves animals, you'll see it on this series, a frenzied documentation of amazing caught-on-tape moments and stories in a world where only the fittest survive. Whether attacking from above, or emerging from the depths, nature's most terrifying confrontations gone awry prove that in the animal kingdom, anything is possible.

This award-winning series presents compelling untold stories and covers a wide array of provocative subjects. "Explorer" aired for 25 years -- the longest-running documentary series in cable TV history -- before being relaunched in 2015 after a five-year hiatus. Each monthly episode of the new "Explorer" takes a similar deep dive inside a story from the pages of a recent National Geographic magazine issue, taking viewers not only to the most remote corners of the globe but also to the furthest reaches of the mind and deepest crevices of history -- on urgent missions of discovery.

Jeremy Wade is not a fisherman; he's an "extreme angler" in search of the biggest and most dangerous freshwater fish, the kind with a taste for human flesh. This action-adventure series also features Wade illustrating how these river monsters are constructed to kill.

"Lockdown" plunges viewers headfirst into life in the "big house," the gritty underworld of America's maximum-security prisons, where gangs are prevalent, predators stalk their next prey and inmates are armed with deadly weapons. But prison officials have their own weapons in the form of modern surveillance and old-time isolation -- plus steel batons and pepper spray -- to help keep the peace in these miniature war zones.

Biologist Jeff Corwin explores the world, exposing and explaining aspects of the diverse animal kingdom. In an educational show that's also made to entertain, Corwin shares his experiences with viewers on fascinating trips into the wild, which is as close as people can get without actually being there themselves.

"Naked Science" strips away the layers of a scientific investigation into one of the big mysteries of our time, revealing through expert analysis realistic scenarios that either confirm or deny long-held assumptions and misconceptions.

British adventurer and cinematographer Richard Terry travels to faraway jungles and remote islands in search of the truth behind stories of unknown creatures attacking, and killing, humans. In the Amazon rainforest, Terry is on the trail of a huge spider said to be attacking villagers; in southern Mexico, reports of a terrifying creature that attacks locals at night sends Terry into the jungles of Chiapas to investigate; and in the Indonesian archipelago, Terry island hops to expose a giant, blood-thirsty reptile that preys on livestock and humans.