François' langur

François' langur, Trachypithecus francoisi, also known as the Tonkin leaf monkey or the white side-burned black langur, is an Old World monkey and the type species of its species group, and one of the least studied colobines. It is distributed from southwestern China to northeastern Vietnam; the total number in the wild is unknown, but fewer than 500 are believed to remain in Vietnam and 1,400 to 1,650 in China, and about 60 live in North American zoos. It is named for Auguste François, the French consul at Lungchow in southern China. It is medium-sized with black, silky hair and very distinct white sideburns from the ears to the corners of the cheeks, and a complex four-chambered stomach for its folivorous diet. Males are 55 to 64 cm long and weigh 6.5 to 7.2 kg, females 47 to 59 cm and 5.5 to 5.9 kg, and infants are born bright orange.