National Geographic Land of the Anaconda: Enter the realm of the monster snake! Enormous snakes...hungry caimans...frenzied piranhas...a barefoot biologist! Jesus Rivas takes off his shoes to study giant anacondas in the swampy heart of Venezuela. Hes searching for the slippery skin of the worlds largest snake. Anacondas may be as long as 30 feet and weigh hundreds of pounds-and their weapon is sheer strength, not poison. Powerful coils literally squeeze the life out of prey, including even the capybara, the largest rodent in the world.