The green anaconda is a member of a family of snakes called constrictors. Constrictors are not venomous snakes. They kill prey by wrapping their bodies around their prey and squeezing until it stops breathing. The giant snake opens its mouth wide enough to swallow its victim—sometimes fish or caiman (relatives of crocodiles) and even jaguars and small deer. Anaconda jaws are held together with stretchy ligaments so they can open wide enough to swallow prey whole.