推荐回答（2个）
犀牛是巨大而笨重的动物，皮厚无毛，每一肢皆具三趾，头上有一或二支角。
犀牛科中有两种分布在非洲，一为黑犀，一为白犀。虽名为黑、白，但他们的皮皆为灰褐色，并无实际的黑白之分。
黑犀牛生活在非洲开阔的大草原。如果水源充足，黑犀的喝水是很频繁。在乾燥的栖所，多汁的植物是他们主要的食物，他们也会在乾河床中掘水。白犀又叫方嘴犀牛，体型较大，常在树荫处或水中活动。另外有三种犀牛分布在亚洲：亚洲犀（二角犀牛）体型最小，成独立的小族群，散布在亚洲的部分地区，总数约在 100到 170只左右。爪哇犀牛，头上只有一角，如今只有在爪哇的保护区中 还有数十只存在。印度犀，也只有一角，和爪哇犀的分别是其角较大，而且皮上的绉褶有不同的排列方式。由於人口增加造成的压力及捕杀的结果，如今只有印度的八个保护区中有大约 600只印度犀存在。
犀牛的社会组织和马不同。成熟的雄白犀占领一块领土，它可允许年幼或年迈的雄性白犀在它的领土内，另有带著小犀牛的雌犀生活在此一地区中。至於黑犀及亚洲犀是独立生活或成对生活，很少形成群体。
犀牛科中，排泄物是标记领域的重要表示。居领导地位的雄性白犀，常将粪便踢散，尿液乱撤，以标示领土，群体中其它的成员都无此种行为。其它种类的犀牛及貘，也有类似的散布粪便、尿液的行为，其目的可能也是在做为领土的记号、标帜吧。
粗大的 犀牛有很厚的皮。印度犀和爪哇犀的外皮是由数个大皮块连接而成，在连接处的皮肤比较薄。犀牛的皮肤上大多没有毛发。
犀牛头上的角，是表皮的衍生物，它是由一大群位於鼻骨之上，含有大量纤维蛋白的表皮细胞堆积而成。雄性的爪哇犀牛，他们的角较短，约二十五公分长，雌性爪哇犀的角只剩一点痕迹。印度犀的角可长达六十公分。亚洲犀在两眼之间有第二只角。苏门答腊之角，在中药上珍贵异常，因属国际保育动物，禁止贩售，中医药学将水牛角取代之。
明、清犀角雕件更是绝古传世珍品。.......
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