The giant desert hairy scorpion (Hadrurus arizonensis) is the largest scorpion in North America, reaching up to 5.5 inches in length. Despite its intimidating size, it is far less dangerous than the much smaller bark scorpion. The giant hairy scorpion is yellowish-tan with a darker back, covered in brown sensory hairs (setae) that give it its common name. It is found throughout the Sonoran and Mojave deserts, including much of Arizona, and is a burrowing species that digs deep tunnels in sandy or gravelly soil. Unlike bark scorpions, giant hairy scorpions are not good climbers and are rarely found inside homes.

The venom of the giant desert hairy scorpion is relatively mild compared to the bark scorpion. A sting typically causes local pain, swelling, and redness similar to a bee sting, and serious medical complications are rare in healthy adults. However, individuals with allergies to insect venom should seek medical attention after any scorpion sting. Giant hairy scorpions are nocturnal hunters that prey on large insects, spiders, and even small lizards and mice. They are solitary and generally non-aggressive — they sting in self-defense when stepped on or handled. Like all scorpions, they glow bright blue-green under UV (blacklight) illumination, making nighttime detection easy.

If you encounter a giant desert hairy scorpion in your yard, it is generally not a cause for alarm — it is a natural part of the Arizona desert ecosystem and poses little threat to healthy adults. However, if you are finding them inside your home or in areas frequented by children or pets, professional treatment is warranted. The same perimeter treatments that control bark scorpions are effective against giant hairy scorpions. Pest Control Bros provides scorpion control across Maricopa, Chandler, Casa Grande, Tempe, Gilbert, and Mesa — free inspections, no contracts, and treatments that work.