Currently, approximately 300 primate species are known to live on the Earth. They are categorized into strepsirrhines, New World monkeys, Old World monkeys, and apes, including Homo sapiens. More than half of the world’s current primates are endangered. Apes are thought to have separated from a common ancestor of Old World monkeys about 30 million years ago.

■References (Books, papers, Web articles, etc.)
『サル学なんでも小事典―ヒトとは何かを知るために』　霊長類研究所編　（講談社、1992）
『新・霊長類学のすすめ』　京都大学霊長類研究所編　（丸善出版、2003）
IUCN
・「霊長類とは」京都大学霊長類研究所
http://www.pri.kyoto-u.ac.jp/topics/bunrui.html　［Editorial note］

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