Locomotion in frog

• The frog's powerful hind legs are adapted for both swimming and leaping.
• The strong extensor muscles of the thigh contract, extending the limb and thrusting the foot against the ground or against the water.
• The thrust is transmitted through the body of the frog by the pelvic girdle and the spine so that the whole animal is pushed forward.
• Flexor muscles of the thigh contract to pull or flex the leg for the next extension.