The Mexican black kingsnake is a completely black snake with no differentiation between its head and neck that primarily feeds upon other snakes and lizards. The Mexican black kingsnake primarily dwells in the Sonoran desert and is nocturnal, unlike the rest of its species.
Mexican black kingsnakes are immune to the venom of other snakes and eat anything that they can overpower, including rodents and birds. They average 40 inches in length and typically constrict their prey to kill it after biting it. The Mexican black kingsnake is known to defecate or emit a musky odor when it's lifted to discourage its predators from consuming it.