Anaconda's are one of the world's largest & longest snake species. They are known to reach sizes of over 6.6 meters (22 feet) long on an average. Reports of Anaconda's that are nearly 35 to 40 feet long also exist, but hard evidence for such sizes is not available. They weigh an average of around 100 kilograms (220 pounds) and sometimes even more. They are usually heavier after immediate consumption of a large prey. The largest specimen was probably measured in Columbia in 1978 which was over 24 feet long and weighed over 300 pounds.