The red colobus of the Niger Delta were removed from the list of the 25 most endangered primates from 2012 to 2014. The removal of the red monkey of the Niger Delta is not bad this subspecies of Pilicolobus is no longer endangered. There is another monkey that is threatened and is of the same genus, as the Tana River red coobus monkey added to this current list. Key Fact The Tana River red colobus monkey and the Niger Delta red colobus monkey are the same genera. They have similar physiological characteristics. Their adult weight is approximately 15-30 pounds. They are normally about 30 inches long. Additionally, they have a similar lifespan of up to 20 years in captivity. The gestation period is approximately 6 months (David). It is difficult to prove how long the life of the wild red colobus is. In captivity they have a regular and abundant food supply. Furthermore, in captivity, red colobus monkeys did not need to face predators, such as leopards, large eagles and humans. Diet Both of these two monkeys are omnivorous monkeys, basically all red coobus are omnivorous. In most cases they use the leaves as the main food supplement (2002). Unfortunately, there are only a couple of species of tree leaves that they can eat. They prefer to choose mature leaf species that contain a high level of nitrogen and a low level of fiber maintenance. Red colobus monkeys supplement this type of cellulose diet with fruit, moss and seeds. Their large three-chambered stomachs contain special bacteria that help them ferment and digest leaves. In a normal situation, they needed two to three kilograms (1996) per day to get enough nutrition. Furthermore, red colobus soil, clay and charcoal help fight the cyanide of some leaves... in the center of the paper... food choices of the red colobus of the Tana river. International Journal of Primatology, 17:63-84 http://link.springer.com/article/10.1007%2FBF02696159.Niger Delta Red Colobus Monkey. Procolobus epieni Grubb and Powell, 1999. Niger Delta, Nigeria. (2008). John F. Oates and J. Lodewijk Werre.Tana River Red Colobus. Procolobus rufomitratus (Peters, 1879). Kenya. (2002, 2004, 2006, 2008). David N. M. Mbora and Thomas M. Butynski.Thomas T. S, Conservation of the red colobus and their habitats, International Journal of Primatology, vol. 26, No. 3, June 2005 (2005) DOI: 10.1007/s10764-005-4364-0.Werre, JLR 2000. Ecology and behavior of the Niger Delta red colobus (Procolobus badius epieni). Doctoral Thesis, City University of New York, New York.Werre, JLR and CB Powell. 1997. The Niger Delta colobus: discovered in 1993 and now in danger of extinction. Oryx 31: 7–9.