Bitis arietans somalica (Somali: Abeeso) also known as the Somali puff adder, is a venomous viper subspecies found only in Somalia, Somaliland, eastern Ethiopia, and northern Kenya. It is distinguished from B. a. arietans by its keeled subcaudals. Normally, B. arietans grows to a total length (body and tail) around 800–900 mm (about 32-36 in). In northern Kenya, Somalia, and Somaliland, though, they grow unusually large, reaching total lengths up to 1,905 mm (75.0 in).
The puff adder (Bitis arietans) is a venomous viper species found in savannah and grasslands from Morocco and western Arabia throughout Africa except for the Sahara and rainforest regions. It is responsible for causing the most snakebite fatalities in Africa owing to various factors, such as its wide distribution, frequent occurrence in highly populated regions, and aggressive disposition. Two subspecies are currently recognized, including the nominate subspecies described here.