A gazelle is any of many antelope species in the genus Gazella or formerly considered to belong to it. Six species are included in two genera, Eudorcas and Nanger, which were formerly considered subgenera. Gazelles are found mostly in the deserts, grasslands, and savannas of Africa; but they are also found in southwest and central Asia and the Indian subcontinent. They tend to live in herds, and eat less coarse, easily digestible plants and leaves.
Gazelles are rather small antelopes, most standing 60–110 cm (2–3.5 ft) high at the shoulder, and are generally fawn-colored.
Currently, the genus Gazella is widely considered to contain about 10 species. Four further species are extinct: the red gazelle, the Arabian gazelle, the Queen of Sheba’s gazelle, and the Saudi gazelle. Most surviving gazelle species are considered threatened to varying degrees. Closely related to the true gazelles are the Tibetan and Mongolian gazelles (species of the genus Procapra), the blackbuck of Asia, and the African springbok.
One widely familiar gazelle is the African species Thomson’s gazelle (Eudorcas thomsoni), which is around 60 to 80 cm (24 to 31 in) in height at the shoulder and is coloured brown and white with a distinguishing black stripe.
More information on Gazelle can be found on Wikipedia.