ges from 23.1-23.5 inches, the tail length ranges from 23.5-26.8 inches, and their weights range from 18.1-24.0 lbs.Diet: Douc langurs are vegetarians, getting adequate protien and fluid by eating leaves,buds, fruit, and flowers. They eat 50 species of plant but no animals. At the zoo, theanimals eat primate chow and various types of greens that they get in a rotating diet. That way the animals get to choose which type of green they want.The keepers at the zoo also like to include enrichment activities in the feeding process. This includes using puzzle feeders and having the animals fish their food out of the water(since they like to soak thier chow!). Mating and caring for young: Douc langurs live in multimale-multifemale groups with 2females to one male. Allo-mothering is also common in captivity, which is the sharing ofthe infant with the other members of the group. Before mating, both genders give asexual signal with the jaw forward, eyebrows raised and then lowered, and a head shake. Single mount and muliple mount matings have been reported. The gestation period isapproximately 165-190 days, and a black-faced infant is born. Sexual maturity is reachedat 48 months for a male and 60 months for a female, whose estrus cycle comes every 28-30 days. Behavior: Red-Shanked douc langurs live in groups of usually 4-25 animals, but up to40. They are dinural and arboreal animals, using the high canopy to locomotequadrupedally. They are visually dramatic as they travel - holding their armsoutstretched above their heads to make spectacular 15-18 foot leaps from tree to tree. These animals rest more and have lower levels of aggression due to digestion, since theyeat leaves and need to sleep often to digest. These animals are partially sympatric to theblack-shanked douc langurs in Vietnam's central highlands.They vocalize by a low-pitched growl that is given as a threat, and also have a call that isshort and harsh which is used as a d...
