Fig. 2. Landmarks used to describe limb, body and tail movements in squirrels during the launch phase: 1, occiput; 2, shoulder over the glenoid fossa; 3, point slightly above wrist; 4, wrist; 5, base of the fifth phalanx of the manus; 6, hip over the greater trochanter; 7, point slightly above ankle; 8, ankle at the lateral malleolus; 9, base of the fifth phalanx of the pes; 10, base of the tail; 11, point slightly above tail base; 12, tip of the tail.