The distribution of extant apes is mostly restricted to the rainforest “refugia*,” with the exception of some populations of common chimpanzees. Gorillas inhabit two large refugia in central Africa, and are divided into two species: western gorillas (Gorilla gorilla) and eastern gorillas (Gorilla beringei).
■References (Books, papers, Web articles, etc.)
『ゴリラ 第二版』 第四章 ゴリラを分類する——種内の変異が示唆すること 山極寿一 （東京大学出版会、2005）
*The specific areas in which many species survived during periods of harsh climate conditions, such as the glacial ages.
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