The bones of the thoracic and pelvic limb in the laboratory animal, ground squirrel, are presented in this paper. While examine the bone structure of limbs in the ground squirrel , a comparative study was made with other laboratory animals, particular the rat. The spine of the scapula is very long and distally continues on as the hamatus process which bears an articular surface for articulation with the clavicle. Arising from the lateral epicondy le on the humerus is a well developed lateral epicondyloid crest. The radius and ulna are of equal width, while the latter is longer due to the size of its olecranon. The thoracic limb has five di gits. Theos coxae bears a caudal ventral iliac spine. The ischial arch is rectilinear. The major and minor trochanter are at the same level. The tibia is slightly convex. The fibula extends to the distal and of the tibia. There are five digits on the pelvic limb.