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
Horn (instrument) the mouthpiece is increased. But, although some pressure is needed, excessive pressure is not desirable. Playing with excessive pressure makes the playing of the horn sound forced and harsh as well as decreases endurance of the player by about half. The Vienna horn is a special horn used primarily in Vienna, Austria. Instead of using rotary valves or piston valves, it uses the Pumpenvalve (or Vienna Valve), which is a double-piston operating inside the valve slides, and usually situated on the opposite side of the corpus from the player's left hand, and operated by a long pushrod. Unlike the modern