Adaptation, Physiological, Hindlimb - physiology, Tendons - physiology, Male, Muscle, Skeletal - physiology, Phylogeny, Motor Activity, Iguanas - physiology, Behavior, Animal, Biological Evolution, Biomechanical Phenomena, Animals, Hindlimb - anatomy & histology, Analysis of Variance, Female, Iguanas - anatomy & histology, Tendons - anatomy & histology, Habi...