GIANT SNAKE PICTURES: Alien Species Invading U.S.?

The world's heaviest snake, the green anaconda is one of nine huge alien snake species that may wreak havoc if they take hold in the United States, according to a U.S. Geological Survey (USGS) report released this week. (Read full story: "Alien Giant Snakes Threaten to Invade Up to 1/3 of U.S.")

The giant snake (pictured in the Peruvian Amazon) can reach lengths of 23 feet (7 meters) and weigh in at 550 pounds (227 kilograms). The olive-green reptiles would flourish in the Florida Peninsula and in southern Texas, regions that have climates similar to the anaconda's native South American habitat, the study authors say. LINK