Some individuals prefer to forage on their own.
They can include males and females, only males, or only females. This is called a fission-fusion social structure. The make-up of individuals in each of these sub-groups change regularly. The group size varies with the environment, with larger groups found in undisturbed forest patches.Ībout one hour before sunrise (earlier between January and April) the group splits into sub-groups for foraging they regroup at night to sleep. White-bellied spider monkeys live in groups of 6 to 25 individuals, sometimes more.
Spider monkeys can also walk on branches using all four limbs or standing up on their hind limbs. They may remain stationary while in this position to eat with both hands. Another is the forelimb swing in which the monkey hangs from a branch with both arms, swings his or her body, and lets go before swiftly grabbing hold of another branch. Tail swinging is yet another form of locomotion - the monkey hangs from his or her tail as an intermediary step between branches. Their most common mode of arboreal locomotion is brachiation (or arm swinging) - the monkey hangs from one branch, swings forward, and hooks onto the next branch with another limb or tail. In the forest canopy, white-bellied spider monkeys move freely between branches and can travel long distances quickly via a number of modes of locomotion. When they do, it is to drink water, eat soil, cross an area with no trees, or run away from an aggressive opponent. These arboreal monkeys spend most of their time in the canopy. White-bellied spider monkeys living in lowland forest have blackish fur on the back and anterior limbs and yellow-creamy color fur on the belly those in montane forests have more variety in color. The incisor teeth are wide, the upper canines are long and curved (slightly shorter in females), and they are very sharp. The upper palate is wider than the lower jaw. The cranium is round and their ears look similar to ours. They have a narrow face with a tiny chin, a narrow snout, and large orbits in which almond-shaped brown eyes are set. It also allows the monkeys to hang still from a branch, with their torso at a sharp angle, while they use their hands to eat.
WHITE CHIMPANZEE FULL
In fact, their tail is strong enough to sustain their full body weight and even propel them while in motion. Spider monkeys can use their tails to grab and hold onto branches. It is prehensile and tactile the under part is bare with ridges like those found on the underside of hands and feet. Their long muscular tail is large at the base, thin at the tip, and able to bend, twist, and curl up. All of these features are perfectly adapted to the monkeys’ suspensory mode of locomotion. Their hands are long, thin, and thumbless their four long fingers form a perfect hook to help them swing on branches. Their shoulders are such that the arms can fully rotate the elbows allow the forearms to pronate and large carpal tendons make their wrists extremely flexible. White-bellied spider monkeys’ limbs are long, muscular, and very strong.
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