title: Neuro-ethological approaches to the study of emotional behavior: stereotypy and variability.
mesh_terms: D000818:Animals; D001070:Appetitive Behavior; D001522:Behavior, Animal; D005075:Biological Evolution; D001921:Brain / Q000502:physiology; D001923:Brain Chemistry; D002490:Central Nervous System / Q000502:physiology*; D003259:Consummatory Behavior; D004644:Emotions; D005824:Genetics, Behavioral; D006706:Homeostasis; D006728:Hormones; D007323:Instinct; D007858:Learning; D009042:Motivation; D009424:Nervous System Physiological Phenomena; D009482:Neurophysiology; D012018:Reflex
chemical_list: D006728:Hormones