title: The development of motivational systems.
mesh_terms: D000828:Animal Population Groups / Q000502:physiology*; D000818:Animals; D000833:Animals, Suckling / Q000502:physiology*; D004327:Drinking Behavior / Q000502:physiology; D005247:Feeding Behavior / Q000502:physiology; D005260:Female; D006706:Homeostasis; D007774:Lactation; D009042:Motivation / Q000502:physiology*; D011247:Pregnancy; D014882:Water-Electrolyte Balance