This represents the extent of some species like the gerenuk (Litocranius walleri), which is present in the north, but is absent in much of the south.    From Wordnik.com.  [Southern Acacia-Commiphora bushlands and thickets] Reference

Excessive hunting had exterminated this antelope over much of its Somalian range by the 1980s but it is still distributed over a wide range in Ethiopia, the largest population found in the Awash Valley north of the Awash N.P. The gerenuk (Litocranius walleri) also occurs and has a wider distribution, extending further south into Kenya.    From Wordnik.com.  [Somali Acacia-Commiphora bushlands and thickets] Reference

Gerenuk (Litocranius walleri) in Buffalo Springs National Reserve, Kenya.    From Wordnik.com.  [Northern Acacia-Commiphora bushlands and thickets] Reference

Dorcas gazelles (Gazella dorcas, VU), Soemmerring's gazelles (Gazella soemmerringii, VU), Salt’s dikdik (Madoqua saltiana), and gerenuks (Litocranius walleri) all still occur.    From Wordnik.com.  [Ethiopian xeric grasslands and shrublands] Reference

The ecoregion also features several species of arid-adapted ungulate: the endangered Grevy’s zebra (Equus grevyi), beisa oryx (Oryx gazella beisa), gerenuk (Litocranius walleri) and lesser kudu (Tragelaphus imberbis).    From Wordnik.com.  [Northern Acacia-Commiphora bushlands and thickets] Reference