Primates are now mostly distributed in and around the tropical rainforests. Japanese macaques are one of the extreme exceptions that live in snowy areas. However, primate fossils are found in wider areas, including North America and Europe. What this means is that the climate of the earth was once warmer climate than it is today, and that rainforests once extended over wider areas.

■References (Books, papers, Web articles, etc.)
How Humans Evolved (Eighth Edition)　　 Robert Boyd Joan B. Silk.　 W. W. Norton & Company; Eighth edition (December 1, 2017)
『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）
『霊長類進化の科学』　　京都大学霊長類研究所編　（京都大学学術出版会、2007）
・「研究所・世界の霊長類、その歴史、現生種の系統図、写真」京都大学霊長類研究所
https://www.pri.kyoto-u.ac.jp/PRI-QandA/BKeitouju.html

Related iCards: The expansion of primate distribution due to climate change (Vol 1.)

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■The References list of “Evolution of Human Sociality”