Uroctonus mordax is a species of scorpion found in the western regions of North America. It is characterized by its dark brown or black coloration and its relatively small size, measuring around 2 to 3 inches in length. U. mordax possesses a venomous stinger located at the end of its tail, which it uses to immobilize its prey. This scorpion is primarily nocturnal and can be found in various habitats, including deserts and grasslands.