The gerenuk (Litocranius walleri) is a medium‑sized antelope belonging to the family Bovidae, subfamily Antilopinae. Endemic to the arid and semi‑arid regions of East Africa, its range extends across southern Ethiopia, northern Kenya, Somalia, and parts of Tanzania and Uganda. Gerenuks favor open savanna, dry grasslands, and scrubby shrubland where sparse vegetation allows them to browse on higher foliage. Their most distinctive feature is an elongated, slender neck and a habit of standing on their hind legs to reach leaves up to two metres above ground, giving them the nickname “giraffe gazelle.” Adults stand 80–100 cm at the shoulder and measure 115–135 cm in head‑body length, weighing 30–45 kg (females) to 50–70 kg (males). The species is monotypic, with no recognized subspecies. Although classified as Least Concern by the IUCN, populations are fragmented and face pressure from habitat conversion, livestock competition, and illegal hunting. Conservation actions include protected‑area management, community‑based monitoring, and research on ecology and genetics to inform sustainable use.

Gerenuks are primarily diurnal, spending the early morning and late afternoon foraging while seeking shade during the hottest part of the day. They live in small, fluid groups of two to six individuals, typically composed of a dominant male, several females, and their offspring. Group composition changes frequently as individuals disperse to establish new territories or join other groups. Males maintain territories of 5–10 km², marked by dung piles and scent‑marking from pre‑orbital glands; they defend these areas through visual displays, high‑stepping gait, and occasional horn clashes. Communication relies on a repertoire of soft whistles, low grunts, and alarm snorts that travel up to 500 m, alerting the herd to predators such as lions, leopards, and African wild dogs. When threatened, gerenuks employ a “stotting” leap, raising their fore‑quarters to gain a better view and to signal vigilance.

The gerenuk is a specialized browser, feeding primarily on leaves, shoots, buds, and fruits of woody plants such as Acacia, Commiphora, and Boswellia species. Its long neck and ability to stand on its hind legs enable it to browse foliage up to two metres high, reducing competition with lower‑grazing herbivores. In the dry season, it supplements its diet with succulent desert plants, lichens, and occasional grasses, and can survive several days without direct water intake by obtaining moisture from succulent browse. Daily intake averages 2–3 % of body weight, roughly 1.5–2 kg of vegetation, consumed in short bouts throughout the day. Gerenuks are selective feeders, preferring tender, protein‑rich leaves and avoiding thorny or highly fibrous parts, which optimizes nutrient absorption in arid environments.

Sexual maturity in gerenuks is reached at about 1.5 years for females and 2 years for males, although successful breeding often occurs later when individuals have secured adequate territory or social standing. The breeding season is loosely timed to the rainy period, which in East Africa typically spans March to May and again in October to December, ensuring abundant browse for lactating females. Gestation lasts 149–150 days, after which a single calf is born, weighing 3–4 kg. Twins are rare but have been documented. Newborns are hidden in vegetation for the first 2–3 weeks, nursing frequently and gaining rapid weight. By six months the calf joins the herd, learning the characteristic upright browsing posture. Females may produce one calf per year under optimal conditions, but harsh droughts can extend the interval between births.

The IUCN classifies the gerenuk as Least Concern, estimating a total population of 250,000–300,000 mature individuals, but acknowledges a declining trend. Primary threats include habitat loss from agricultural expansion, overgrazing by livestock, and conversion of shrubland to cropland, which fragment the species’ range and reduce available browse. Poaching for meat and trophies, though not as intense as for larger antelopes, adds localized pressure, especially in regions with weak law enforcement. Competition with domestic goats and cattle for water and forage intensifies during droughts, leading to increased mortality. Climate change exacerbates these challenges by lengthening dry periods and altering vegetation composition. Conservation measures focus on maintaining and expanding protected areas, community‑based anti‑poaching patrols, and promoting sustainable livestock practices to mitigate competition.

• Gerenuks can stand on their hind legs for up to 30 seconds while feeding.
• Their neck can extend nearly 30 cm beyond the body, allowing high browsing.
• They have a unique “stilted” gait that helps them spot predators over tall grass.
• Unlike many antelopes, gerenuks obtain most of their water from succulent plants.
• The species is monotypic, with no recognized subspecies across its range.