The wolf spiders belong to a large group. The smallest are less than 0.04 inches (1 mm) in body length. The largest are around 1.5 inches (38 mm) in body length. Some wolf spiders spend all of their lives above ground (taking the best shelter they can find), others dig burrows but come out of the burrows to wander about and hunt, and some spend almost all of their lives waiting for passing insects in their burrows.