title: Environmental enrichment and crowding: behavioral and hormonal effects.
mesh_terms: D000311:Adrenal Glands / Q000502:physiology; D000374:Aggression / Q000502:physiology; D000818:Animals; D001522:Behavior, Animal / Q000502:physiology*; D003441:Crowding / Q000502:physiology*; D005260:Female; D005849:Gerbillinae; D006801:Humans; D006854:Hydrocortisone / Q000097:blood*; D008297:Male; D012737:Sex Factors; D012919:Social Behavior; D012931:Social Environment; D013737:Testis / Q000502:physiology; D013739:Testosterone / Q000097:blood*
chemical_list: D013739:Testosterone; D006854:Hydrocortisone