The Boa Constrictor is a smaller relative of the Green Anaconda. Unlike the Green Anaconda, the Boa Constrictor is a great pet for snake owners. For snake owners who forget to feed a snake, the Boa Constrictor won't feel hungry for several months because they have a slow metabolism. When it does feel hungry, Boa Constrictors eat small mammals, birds, frogs, and reptiles. But Boa Constrictors have actually been known to eat rodents the size of a Dog.