Aliens vs Predators - Python Invasion of the Everglades

Straight out of science fiction, a six-foot alligator ends up dead inside the belly of a 13-foot python. Why did these two massive predators come to mortal blows? And how did a Burmese python end up in Florida to begin with? It's a battle Mother Nature never intended, but as a whole host of exotic species invades and multiplies in the Everglades, the ensuing battles are increasingly pitting huge alien creatures against native apex predators. Everything from Burmese pythons to Nile monitor lizards are infiltrating Florida's swamp lands. Already, the aliens have breached the defenses and are marching onward - unleashing a ferocious turf war. We investigate the full extent of the invasion - tracking the aliens as they are smuggled through airport X-ray machines or hitch rides on cargo containers. Some - like the pythons - are crossing the borders legally. Over the past five years, more than 144,000 Burmese pythons have been imported into the U.S. as exotic pets. But these alien darlings soon become colossal, dangerous beasts - and many owners find it easier to abandon them to the Everglades.. But Florida is not the only beachhead for alien invaders. We visit Chesapeake Bay where snakeheads are devouring everything in sight. We also look in on a tropical island paradise, where a small reptilian raiding party has conquered the island of Guam. A disturbing pattern emerges: across the planet, invasive species have become a major cause of extinction. Once the reptilian invader establishes a foothold, they are impossible to eradicate. Is there any hope for Florida's last bastion of wild paradise? National Geographic fuses science, forensics and natural history to deconstruct the latest, bizarre encounter between a native gator and a massive Burmese python. We recreate the grisly autopsy and work our way through tantalizing clues - and at the story's climax, we use the evidence to reconstruct exactly what happened during that epic clash. As our investigation unfolds, we probe the full extent of this mounting invasion. Could an entire army of alien forces be poised to conquer, kill and take over the Florida Everglades?