Horn of Africa periodic monsoon winds and irregular rainfall. Mean daily maximum temperatures range from , except at higher elevations along the eastern seaboard, where the effects of a cold offshore current can be felt. Somalia has only two permanent rivers, the Jubba and the Shabele, both of which begin in the Ethiopian Highlands. About 220 mammals are found in the Horn of Africa. Among threatened species of the region, there are several antelopes such as the beira, the dibatag, the silver dikdik and the Speke's gazelle. Other remarkable species include the Somali wild ass, the desert warthog, the hamadryas baboon, the Somali
Natural horn for natural horn. Benjamin Britten's "Serenade for Tenor, Horn and Strings", though written for the modern horn, makes notable use of the F harmonic series and has been recorded at least once on a natural horn. György Ligeti's "Hamburg Concerto" makes a great use of the natural horn and of natural sounds on the modern horn in the solo part and requires four natural horns in the orchestra. Below lists natural horn keys with their corresponding fingering on the modern horn. If a piece of music says the key on the left you can press the key combination on the