Causes (3) Animals (3) Origin (3) Origen (3) Fauna (3) Animales (3) Origines (3) Animaux (3) Brittleness (2) Animal models (2) Nineteen seventies (2) Nineteen sixties (2) Walking (2) Springs (Mechanism) (2) Social participation (2) Social history (2) Psychology, Pathological (2) Psychiatry (2) Morale (2) Monkeys (2) Mental illness (2) Humanity (2) Goal (Psychology) (2) Gait in humans (2) Depression, Mental (2) Technique (2) Social life and customs (2) Separation (2) Locura (2) Enfermedades mentales (2)