Grant's gazelle (Nanger granti) is a relatively large species of gazelle antelope, distributed from northern Tanzania to South Sudan and Ethiopia, and from the Kenyan coast to Lake Victoria. Its Swahili name is swala granti. It was named for a 19th-century British explorer, James Grant.
Grant's gazelle is genetically related to Soemmerring's gazelle (N. soemmerringii) and Thomson's gazelle (Eudorcas thomsonii) with Soemmering's gazelle being the closer relative. Grant's gazelle shows high genetic variation among its populations, although there is no geographic isolation. The differentiation of the species may have evolved during repeated expansion and contraction of arid habitats during the late Pleistocene era in which populations were possibly isolated. Grant's gazelle was formerly considered a member of the genus Gazella within the subgenus Nanger before Nanger was elevated to genus status. In 2021, the American Society of Mammalogists granted full species status to Bright's gazelle (Nanger notatus) and the Peter's gazelle (Nanger petersii).
Grant's gazelle are found in several countries in East Africa, including Ethiopia, Kenya, South Sudan and Tanzania, where they live in small to midsized herds, separated into females with juveniles and bachelor groups; during the mating season, when males become territorial and protective over a harem of females to breed with, bachelor herds briefly married disperse before tensions die-down again. Confrontations between hormonal males rarely end in violence or death, with the ‘loser’ simply fleeing.
Grant’s gazelle prefer living on short, grassy plains where they can graze, but can also be found browsing and foraging in more sparse, arid scrublands; they avoid areas with excessively high, untrimmed grass with compromised visibility of predators. They also occur in semiarid areas, being relatively well-adapted to drier areas, relying on more arboreal browse or shrubby, leafy material during the dry seasons to supplement their intake of water. They are sometimes seasonally migratory, but do not travel along the same routes as most of the other savanna ungulates, such as the Cape buffalo, plains zebra, Thomson’s gazelle and the white-bearded gnu, which are all far more susceptible to dehydration. Grant’s gazelle can subsist on vegetation in waterless, semiarid areas, where they face considerably less resource competition.
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