Anacondas, like boas and pythons, are constrictors, only, instead of in trees or on the ground, they do most of their squeezing in the drink. About the length of a bus, the largest anacondas could easily accommodate a human meal, but, despite their Hollywood portrayal, they normally stick to their natural prey - anything nonhuman that dares share their space in the water and is big enough to make a decent dinner. Since they don't chew, swallowing whole, they often end up sporting a hefty lump after the hunt. So, they retreat to a hole at the base of a tree and coil up for a long digestive rest.