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François' langur (''Trachypithecus francoisi''), also referred to as Francois' leaf monkey, Tonkin leaf monkey, or white side-burned black langur〔(【引用サイトリンク】url=http://www.arkive.org/francoiss-langur/trachypithecus-francoisi/#text=Facts )〕 is a species of lutung and the type species of its species group. It is the least studied of the species belonging to the Colobinae subfamily. The species is distributed from Southwestern China to northeastern Vietnam. The total number of wild individuals is unknown, but there are believed to be fewer than 500 left in Vietnam and 1,400–1,650 in China. There are about 60 langurs in captivity in North American zoos. The species is named after Auguste François (1857–1935) who was the French Consul at Lungchow in southern China.〔The Eponym Dictionary of Mammals - Page 141 Bo Beolens, Michael Watkins, Michael Grayson - 2009 "François' Leaf Monkey ''Trachypithecus francoisi'' Pousargues, 1898 (François' Langur ) Auguste François (1857–1935) was the French Consul at Lungchow in southern China, where he was the first person to bring this monkey to the ..."〕 == Physical description == François' langur is a medium-sized primate with black silky hair. It has very distinct white sideburns that grow down from its ears to the corners of its cheeks.〔 A morphological specialization of François' langur is its complex stomach, made up of four separate chambers. This is a necessary adaptation for the digestion of its folivorous diet.〔 This species shows sexual dimorphism in its size. Males have a head-body length of , while females are only in length. Males likewise have longer tails of compared to the for females. Males are significantly heavier than females, weighing compared to for females. Infants weigh at birth.〔 François' langur has large salivary glands to begin the digestion of tough leaf fibers. A more notable evolutionary adaptation seen in this langur is the sacculated stomach with two chambers. In the upper chamber, bacteria help to continue the breakdown of fibers started by the saliva. The upper chamber has a relatively normal pH, to create favorable conditions for bacterial growth. The lower chamber is similar to that of other mammals, in that it contains the acids that finish the breakdown of food components.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「François' langur」の詳細全文を読む スポンサード リンク
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