: Behaviorists often evaluate actions based on their immediate cause, how they change over a lifespan, their survival function, and their evolutionary history.
The separation between is an artificial one. In reality, behavior is the outward expression of internal biology. A trembling dog is a physiological event—increased sympathetic nervous system output, elevated catecholamines, muscle tension. A grooming cat is a neurological event—serotonin regulation, endorphin release, learned motor patterns. Video De Zoofilia Perro Gay Penetrado Por Hombre