Conflicts between territorial Ugandan kob ("K. k. thomasi") are usually settled with ritual and rarely actual fighting, whether in conventional territories or leks. A male usually needs only to walk in an erect posture towards the intruder to displace him. Neighboring males in leks do the same thing when they encounter their borders. Lek-holding white-eared kobs fight more often. Ugandan kob do sometimes sustain serious or fatal injuries, especially when control of a territory is at stake. Fights usually involve the combatants clashing, pressing and twisting each other with their horns head-on. However, a neighbor may attack from the rear or side. In lek clusters, the most dominant males occupy the center. The number of males in the center of a lek cluster ranges from three to seven, and their leks are the most clustered and they monopolize copulations with estrous females. Replacement of males in leks are much more common than in traditional territories, and most males are able to stay in the centre positions for only a day or two and rarely up to a week. This is largely due to intense competition and because most males leave their territories to feed and drink. Centrally located males reduce their chances of being replaced by leaving to feed during periods of relative calmness, yet they are not able to get enough food and water and have to eventually leave their leks. However, a male can gain enough energy after a week or two, and try to take back his position. At every lek cluster, males are always waiting take or retake a central lek. Males in traditional territories are able to stay for at least a year or two.