Elaphe obsoleta is a species of snake commonly known as the black rat snake. There are several synonyms for this species, including Pantherophis obsoletus, Coluber obsoletus, and Elaphe alleghaniensis. Despite the name, black rat snakes can range in color from gray to brown and can grow up to six feet long. They are non-venomous and commonly found in North America, often living in abandoned buildings, forests, and fields. Black rat snakes are known for their ability to climb trees and their diet consists of small animals such as rodents, lizards, and birds. These snakes play an important role in controlling rodent populations in their habitats.