She discovered that chimps will systematically hunt and eat smaller primates such as colobus monkeys. She discovered that chimps will systematically hunt and eat smaller primates, such as colobus monkeys. Other primates found in large numbers are the red colobus, red-tailed and blue monkey. Red colobus monkeys have overlapping ranges with other troops. Females have even been observed to kill immigrant males in wild red colobus monkeys. The western red colobus is frequently hunted by the common chimpanzee. When it first opened the exhibit featured capuchin, colobus, and spider monkeys. The diet of red colobus monkeys consists mainly of young leaves, flowers, and unripe fruit. The coastal forests and mangroves are home to Zanzibar red colobus and mudskippers. They are closely related to the red colobus monkeys of genus "Piliocolobus". Troops of black-and-white colobus monkeys can often be seen in the dense growth. Unlike other species of colobus monkey, black colobuses have no white markings. All mangabeys and most colobus monkeys weigh considerably in excess of at maturity. The forest is home to the rare red colobus monkey. The red colobus is endemic to tropical West Africa.