Massive Green Anaconda in the Pantanal! The green anaconda (Eunectes murinus) is the largest snake in the world by weight and the second longest after the reticulated python. Native to South America’s swamps, marshes, and slow-moving rivers, it can grow up to 30 feet (9 meters) long and weigh over 550 pounds (250 kilograms). As a powerful constrictor, it preys on fish, birds, mammals, and even caimans, using its muscular body to suffocate its prey before swallowing it whole. Despite its size, th