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犀牛的挽歌：5个种类全部濒危 武装部队严密保护
source link: http://tech.sina.com.cn/d/a/2017-12-10/doc-ifypnsip4041007.shtml
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文章来源：《半个地球：人类家园的生存之战》节选世界上现存的犀牛有27000只。而一个世纪以前，在非洲平原及亚洲雨林中生活着数百万只犀牛。犀牛共有5个种类，目前全都处于濒危状态。大部
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