Territorial blue wildebeest bulls can be spotted at several waterholes in Etosha National Park. Establishing their territory around these important drinking places is like hitting the jackpot for these bulls because the females have to come to the water at least once a day. This is the opportunity to mate with many females, but it is equally exhausting to keep all the rivals at bay. For intruding bulls this is also a problem because they will be chased away by the “owner” of the territory.