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ossicone
Ossicones are horn-like (or antler-like) protuberances on the heads of giraffes, male okapis, and their extinct relatives, such as ''Sivatherium'', and the climacoceratids, such as ''Climacoceras''.〔''University of Washington.'' University of Washington, n.d. Web. 15 Feb. 2010.()〕 Only giraffes and okapis have true ossicones (as opposed to horns or antlers). The base that a deer's antlers grow from is very similar to an ossicone.
Ossicones are similar to the horns of antelopes and cattle, save that they are derived from ossified cartilage,〔"The Nashville Zoo at Grassmere - Animals :: Masai Giraffe." ''Nashville Zoo at Grassmere.'' The Nashville Zoo at Grassmere, n.d. Web. 15 Feb. 2010. ()〕 and that the ossicones remain covered in skin and fur, rather than horn. Antlers (such as on deer) are derived from bone tissue: when mature, the skin and fur covering of the antlers, termed "velvet," is sloughed and scraped off to expose the bone of the antlers.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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