Outdoorsmen protect workers on the edges of society.

Cory has traveled more than 300 miles where workers fear a nearby jaguar. Jason is near Alaska to protect a remote mining camp from bears.

One man's trash is another bear's treasure. Rob and Puma rush to help out a business owner who has spotted several black bears by the nearby dumpster.

Cory is called to a fish hatchery in Costa Rica where the workers are dealing with crocodiles in the ponds.

Rob and Puma volunteer to help the New Mexico Game and Fish Department track a mountain lion.

Rob and Puma are hired to stop an infestation of black bears at a resort. The owners fear that an increase in bear activity could lead to an encounter with a guest or employee.

Extreme survivalists go head to head in a race across the Alaska wild. Using ingenuity, experience and just the gear they can carry in their packs, the participants have 60 hours to reach the finish point of each leg of the adventure -- the series features 13 legs -- and in addition to navigating treacherous glaciated river valleys, barren ridgelines, and high mountain peaks, the challengers battle hunger, dangerous predators and unpredictable weather. There is no grand prize awaiting each leg's winner, other than the pride of accomplishing a grueling feat. For season three, the 12 competitors are divided equally into four teams -- Military, Endurance, Alaskans and Lower 48.

Fishing for bluefin tuna is a way of life for many residents of Gloucester, Mass. "Wicked Tuna" takes viewers into the unrelenting North Atlantic waters infamously spotlighted by the novel-turned-feature film "The Perfect Storm," to follow captains who are relied upon by their families, their shipmates, and by Gloucester itself, to haul in boatloads of the large but elusive bluefin. The pressure to deliver is unforgiving -- the fishing season is short and tuna populations are dwindling -- but one "monstah" catch can reel in just as large of a payday.

Featuring pop-ups with fun facts and insights into the fishermen's thoughts.

Mick Dodge is one with the woods, having left modern conveniences behind 25 years ago to live among the trees, caves and animals in Washington state's Hoh Rain Forest. It's not an easy life by any means -- he sleeps in tree stumps and has no easy access to food -- but each day presents a different adventure, and as the always-barefoot Dodge says, "All I have to do is follow my feet." He's walking in the footsteps of four generations of Dodge men who have called the Olympic Peninsula their home, and because the intensely private former Marine allowed National Geographic access to his world, this time viewers are welcomed to witness the primal life of "The Forrest Gump of Middle Earth."

Wilderness guide and survival instructor Hazen Audel attempts to stay alive in some of the world's most inhospitable places by using centuries-old techniques. Hazen joins tribes in the rainforests of Ecuador, the Kalahari Desert of Namibia, the mountains of western Mongolia, the frozen Arctic of Canada, in equatorial Kenya, and on a remote island in the Pacific Ocean to learn the skills firsthand. He hunts with bows and poisoned arrows, climbs harsh mountains in search of prey, and harvests food beneath shifting sea ice, among other challenges that push him to his limits.

When bears, wolves and foxes are your only neighbors, life can be pretty lonely. Add minus-60-degree days and a constant battle for the most basic necessities, and you have the daily challenges of people who live in remote corners of Alaska. This series takes viewers deep into an Alaskan winter to meet tough, resilient residents as they try to stay one step ahead of storms and man-eating beasts to survive the season. The closest neighbor to Sue Aikens is more than 300 miles away. Eric Salitan subsists solely on what he hunts and forages. Chip and Agnes Hailstone catch fish for currency in bartering for supplies, and Andy and Kate Bassich use their pack of sled dogs for transportation. Also highlighted is a time of year not always part of what viewers see in Alaska: spring! Ice is breaking, animals are waking, and residents face new tests before deep cold returns.