A three chambered stomach with a large holding area slightly protected from the lower acid allows bacteria to break down cellulose and some toxins. Elevated amounts of saliva also hinder acids from disrupting the bacterial processing. Bachelor groups are also known. A single young is usually produced every 20 months although a set gestation is not commonly agreed upon. Infants are completely white at birth but gain full adult coloration around four months.
Maturity is reached between four and six years.
Lifespan appears to be in excess of 20 years. Although some colobus species are endangered, this species is not currently listed as such. Ornamental trimming for clothing as well as wall hangings are produced from the pelt. A great reference book on primates is Noel Rowe's The Pictorial Guide to the Living Primates . Protecting colobus monkeys in the wild Dr. David Macdonald's Encyclopedia of Mammals is one of the great standards for mammal information including the colobus.