This is one frightening-looking snake, primarily because it is the largest snake in the world. People are often surprised to learn that anacondas don’t have any venom. They don’t need any. An anaconda simply wraps itself around its prey, which may be another reptile, bird, or even a mammal. It lifts its prey above the ground, squeezes it hard, and then swallows it whole, usually starting with the head. That, needless to say, creates a big bulge in the anaconda’s silhouette. Visitors to the Amazon may see anacondas in the river, typically with only their heads above the water’s surface.