Anacondas in the wild spend most of their time hanging out in rivers hunting for their food. They are solitary creatures that are somewhat shy and not many of them are easily seen. They are very well camouflaged in the swamps and bogs in which they thrive. There are some historical reports of early European explorers of the South American jungles seeing giant anacondas up to 100 feet long and some of the native peoples of the South American jungle have reported seeing anacondas up to 50 feet long. No one has caught and measured an anaconda anywhere near that size. It is important to note that when a dead anaconda's hide or skin is laid out it can be stretched very easily, expanding to much longer lengths than the snake exhibited when alive. Reports of outsize anacondas that cannot be verified are usually due to distortions in perception, or a snake skin being disproportionately stretched and inaccurately measured. People are generally really bad at estimating length, especially for larger snakes. In fact, the larger the snake, the larger the margin of error.