Like us, snakes are vertebrates, which means they have a backbone consisting of numerous vertebrae that provide their bodies with flexible support. They share this characteristic with fishes, amphibians, other reptiles, and mammals.
Ecologically, they are both predator and prey. Snakes are a food source for birds, mammals, and other reptiles. Conversely, they feed on birds, mammals, amphibians, fish, and insects. Many species of small pests, such as rodents and slugs, are eaten by snakes.