Abstract
The social organization of the gerenuk in Tsavo East National Park, Kenya, is characterized by single adult .male..male. on territories encompassing their entire home ranges, small .female. groups of variable composition, often associated with territorial .male..male., and small groups of subadult .female..female.. There appear to be no non-territorial adult .male..male. (bachelors). Subadult .male..male. wander about considerably, often alone, before they succeed in taking over a territory. Territorial .male..male. perform linked urination/defecation and mark [scent] dry twigs with the antorbital gland secretion. Agonistic and courtship behavior resemble those of other gazelles. Mother-young relations conform to the hider type among bovids.