page_title: Waterbuck
section_title: Ecology and behaviour
hierarchical_section_title: Waterbuck / Ecology and behaviour
caption_attribution_description: Image taken in Samburu N.P., Kenya. This subspecies is found to the east of the Rift Valley with Defassa Waterbuck being found to the west of the Rift Valley.
context_page_description: The waterbuck is a large antelope found widely in sub-Saharan Africa. It is placed in the genus Kobus of the family Bovidae. It was first described by Irish naturalist William Ogilby in 1833. The thirteen subspecies are grouped under two varieties: the common or Ellipsiprymnus waterbuck and the Defassa waterbuck. The head-and-body length is typically between 177–235 cm and the average height is between 120 and 136 cm. A sexually dimorphic antelope, males are taller as well as heavier than females. Males reach approximately 127 cm at the shoulder, while females reach 119 cm. Males typically weigh 198–262 kg and females 161–214 kg. The coat colour varies from brown to grey. The long, spiral horns, present only on males, curve backward, then forward and are 55–99 cm long.
  Waterbuck are rather sedentary in nature. A gregarious animal, the waterbuck may form herds consisting of six to 30 individuals. These groups are either nursery herds with females and their offspring or bachelor herds. Males start showing territorial behaviour from the age of five years, but are most dominant from the age of six to nine.
context_section_description: Waterbuck are rather sedentary in nature, though some migration may occur with the onset of monsoon. A gregarious animal, the waterbuck may form herds consisting of six to 30 individuals. The various groups are the nursery herds, bachelor herds and territorial males. Herd size increases in summer, whereas groups fragment in the winter months, probably under the influence of food availability. As soon as young males start developing horns (at around seven to nine months of age), they are chased out of the herd by territorial bulls. These males then form bachelor herds and may roam in female home ranges. Females have home ranges stretching over 200–600 hectares (0.77–2.32 sq mi; 490–1,480 acres). A few females may form spinster herds. Though females are seldom aggressive, minor tension may arise in herds.
  Males start showing territorial behaviour from the age of five years, but are most dominant from the age of six to nine. Territorial males hold territories 4–146 hectares (0.015–0.564 sq mi; 9.9–360.8 acres) in size. Males are inclined to remain settled in their territories, though over time they may leave inferior territories for more spacious ones. Marking of territories includes no elaborate rituals - dung and urine are occasionally dropped. After the age of ten years, males lose their territorial nature and replaced by a younger bull, following which they recede to a small and unprotected area. There is another social group, that of the satellite males, which are mature bulls as yet without their own territories, who exploit resources, particularly mating opportunities, even in the presence of the dominant bull. The territorial male may allow a few satellite males into his territory, and they may contribute to its defence. However, gradually they may deprive the actual owner of his territory and seize the area for themselves. In a study in the Lake Nakuru National Park, only 7 percent of the adult males held territories, and only half of the territorial males tolerated one or more satellite males.
  Territorial males may use several kinds of display. In one type of display, the white patch on the throat and between the eyes is clearly revealed, and other displays can demonstrate the thickness of the neck. These activities frighten trespassers. Lowering of the head and the body depict submission before the territorial male, who stands erect. Fights, which may last up to thirty minutes, involve threat displays typical of bovids accompanied by snorting. Fights may even become so violent that one of the opponents meets its death due to severe abdominal or thoracic wounds. A silent animal, the waterbuck makes use of flehmen response for visual communication and alarm snorts for vocal communication. Waterbuck often enter water to escape from predators which include lions, leopards, cheetahs, African wild dogs and Nile crocodiles (leopards and spotted hyenas prey on juveniles). However, it has been observed that the waterbuck does not particularly like being in water. Waterbuck may run into cover when alarmed, and males often attack predators.
caption: A female herd in the Samburu National Park (Kenya)
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