Most gorillas are diurnal and forage mostly on ground from sunrise to nightfall. They usually feed in the mornings and afternoons with a long mid-day break and rest in between. There is little aggression amongst members of the same family. Western gorilla shows visual signs through facial expressions. They exhibit around 22 distinct sounds. barks, grunts, hoots and screams. Hoots could be contact call to tell forest location. Gorillas displays quadrupedal knuckle walking. Mountain gorillas are totally folivorous whereas wild gorillas are vegetarians but captive gorillas readily eat meat.
This is a primate whose fur coloring varies from dark-brown and light-brown to black, sandy colours. The feet and hands are white. likewise there is a ring of white hair surrounding the black face. They are literally aerial acrobats.Gibbbons are predominantly brachiators, moving through the forest by swinging from one branch to another by the use of their arms. It has curved fingers, very long arms, elongated hands, short legs. Although they rarely come to the ground, while down they walk bipedally raising their arms above their heads. Gibbons have got tough, bony padding on their buttocks called ischial callosities. Gibbons are frugivorous.The white handed gibbons are arboreal and diurnal. White handed gibbons protect their family groups by warding off the rest of the gibbons by their calls. Every morning each family gathers on the territorial edge and starts a “great call”, which is a duet between the mating pair.This is their way of communication.
The Bolivian titi is a species of titi. It is from eastern Bolivia and a tiny territory of Brazil. The Bolivian titi is diurnal, cryptic and lives in small groups of families. It is monogamous in nature and mates for life and stays in groups that are made up of 2 to 7 members. some 5 young ones and 2 adults.