For years, wildlife filmmaker Casey Anderson has tracked mountain lions by his home in Montana, but always from a distance. That all changes when he's invited by a Chilean filmmaker to join a film crew in Chile's Torres del Paine National Park, home to what may be the densest population of pumas on Earth. Follow his once-in-a-lifetime opportunity to get an up-close look at these normally reclusive creatures. See how, in this protected environment known as the Puma Triangle, these big cats behave in ways unlike anywhere else on the planet.

Stream with Smithsonian Channel