From: National Geographic Channel on Fri, May 06 2011 3:05 PM

Hunters have begun to discover unusually giant wild hogs throughout North America. How did these hogs evolve into such a size?

From: National Geographic Channel on Fri, May 06 2011 3:05 PM

Dr. Brady Barr builds a fake hippo suit so he can get close enough to the real hippos to gather their sweat.

From: National Geographic Channel on Fri, May 06 2011 3:05 PM

When a pack of wild dogs attack a group of mongooses, the cute little critters put up a darn good fight.

From: National Geographic Channel on Fri, May 06 2011 3:04 PM

In Cambodia, giant venomous spiders aren’t terrifying, they're a tasty treat!

From: National Geographic Channel on Fri, May 06 2011 3:04 PM

Producer Nick Stein and crew invade the Florida Everglades by air and by sea.

From: National Geographic Channel on Fri, May 06 2011 3:03 PM

Border patrol agents discover a man wanted for murder in Miami attempting to cross the border into the US.

From: National Geographic Channel on Fri, May 06 2011 3:03 PM

Nick’s on scene at the largest seizure of heroin in the Nogales Port of Entry's history.

From: National Geographic Channel on Fri, May 06 2011 3:03 PM

Border agents prepare to fly in and repel off of a mountain to rescue an errant border crosser.

From: National Geographic Channel on Fri, May 06 2011 3:03 PM

A huge array of surveillance cameras monitor the fenceline at the border. Nick and the crew show us how it all works.

From: National Geographic Channel on Fri, May 06 2011 3:03 PM

The camera operator is 'attacked' in the intermediate force training room.

From: National Geographic Channel on Fri, May 06 2011 3:03 PM

Nick discusses complex socioeconomic issues and the dangers of life at the border.

From: National Geographic Channel on Fri, May 06 2011 3:03 PM

A man with a criminal record gets an elaborate inspection every time he reaches the border.

From: National Geographic Channel on Fri, May 06 2011 3:03 PM

The crew from Border Wars gets completely lost in the brush chasing illegal immigrants.

From: National Geographic Channel on Fri, May 06 2011 3:03 PM

Both beautiful and dangerous, the Rio Grande is the site of local fishing — and tragic death.

From: National Geographic Channel on Fri, May 06 2011 3:03 PM

Both producer and patrolman have climbed through the swampiest swamps to chase down immigrants and chase down a story.

From: National Geographic Channel on Fri, May 06 2011 3:03 PM

The black hawk’s light spots runners in the desert brush, and Nick and his crew take off to film the action.

From: National Geographic Channel on Fri, May 06 2011 3:03 PM

See just how much it takes to be able to both explore and film the cave in the midst of crippling heat and humidity.

From: National Geographic Channel on Fri, May 06 2011 3:03 PM

Climbers have arrived at an unexplored shaft that descends several hundred meters — will they find a new crystal cave?

From: National Geographic Channel on Fri, May 06 2011 3:03 PM

One of the directors of photography explains how the crew will shoot a 150 shaft - with no natural light!

From: National Geographic Channel on Fri, May 06 2011 3:03 PM

Expert climber Mark Beverly explains just how he’s attempting to explore never-before-seen caves.