Giant Crab Spider Facts

Including its legs, the giant crab spider spans about 2 to 2-1/2 inches. It often extends its legs out to the sides of its body at a right angle and frequently moves sideways like a crab.

This spider is adept at climbing vertically and can be spotted on ceilings or high on walls. This ability can distinguish the giant crab spider from other species that are not good climbers. This spider is found in the Southwest, particularly Arizona, and prefers the hot, dry climate. It tends to hide under rocks or dead cactuses. The giant crab spider has a fairly flat abdomen, so it can slip into narrow crevices to hide.

Though most varieties of crab spiders are passive hunters that patiently await passing prey, the giant crab spider wanders at night in search of food and uses its speed to catch it.

The bite of a giant crab spider is reportedly painful, though not considered harmful to humans. Like the bites of other crab spiders, only allergic reactions may occur in some people, though this is rare.