The gerenuk /ˈɡɛrɛnuːk/, Litocranius walleri, also known as the Waller's gazelle, is a long-necked species of antelope found in dry thorn shrubland and desert in the Horn of Africa and the African Great Lakes region. The word gerenuk comes from the Somali language, meaning "giraffe-necked". Gerenuk are sometimes also called the giraffe-necked antelope. It is the sole member of the genus Litocranius.
Gerenuks have a relatively small head for their body, but their eyes and ears are proportionately large. Only the males have horns and they also have a more muscular neck than females. Both sexes have ruddy brown coats with a paler underbelly . The gerenuk is easily recognizable from its distinctive long and skinny neck which can be elongated further if need be for activities like feeding off the taller brambles and undergrowth of the desert. It also has remarkably long slender legs which are another great advantage as they can gallop away into the distance at very high speeds from any form of predator trying to attack. However, because of the extreme length of their legs, they can be more liable to fracture of the leg bone. From head to tail, the gerenuk is around 59 in long. Males are a little taller than females, at 35–41 in. Many breeders of gerenuks and zoologists have described gerenuks as being extremely humble animals, always helping fellow gerenuks. In ancient African tribal tales, the gerenuk has often been crowned 'Queen of Humbleness.'
Gerenuks seldom graze but browse on prickly bushes and trees, such as acacias. They can reach higher branches and twigs than other gazelles and antelope by standing erect on their rear legs and elongating their necks. They appear to favor the more tender leaves and shoots, but will also eat buds, flowers, fruit, and herbaceous plants. Gerenuks do not appear to drink water; they get enough water from the plants they eat. Because of this, they can survive in very dry habitats. Gerenuks are often prey for lions, cheetahs, jackals and leopards.