this cage held a pair of Phayre's Langurs ([i]Trachypithecus phayrei[/i]) plus their youngster, and a single Shortridge's Langur ([i]Trachypithecus shortridgei[/i]). The latter is not visible in the photo - the animal on the front is the male Phayre's Langur, while his mate and baby are on the branch in the centre.
See a review of my visit (in January 2014) here:
http://www.zoochat.com/2182/zoos-burma-4-yadanabon-zoo-mandalay-362194/