The anaconda is a type of boa. In fact, it is the only boa that lives in water. For this reason, the anaconda is also known as the water boa. Like all boas, the anaconda also kills its prey by suffocating it. It usually lies still in streams or swamps waiting for its prey to come near. The snake then grabs the unsuspecting victim with its powerful jaws and pulls it underwater to drown it.