ATELES CHAMEK PDF

This adaptation to their strictly arboreal lifestyle serves as a fifth hand. Unlike many monkeys, they do not use their arms for balance when walking, instead relying on their tails. The hands are long, narrow and hook-like, and have reduced or non-existent thumbs. Heads are small with hairless faces. The nostrils are very far apart, which is a distinguishing feature of spider monkeys.

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This adaptation to their strictly arboreal lifestyle serves as a fifth hand. Unlike many monkeys, they do not use their arms for balance when walking, instead relying on their tails. The hands are long, narrow and hook-like, and have reduced or non-existent thumbs. Heads are small with hairless faces. The nostrils are very far apart, which is a distinguishing feature of spider monkeys.

They have been seen in the wild jumping from tree to tree. This urine is emptied at the bases of the clitoris, and collects in skin folds on either side of a groove on the perineal. Spider monkeys form loose groups, typically with 15 to 25 individuals, [23] but sometimes up to 30 or The size of subgroups and the degree to which they avoid each other during the day depends on food competition and the risk of predation.

The average subgroup size is between 2 and 8 [26] but can sometimes be up to 17 animals. Males tend to stick together for their whole lives. Hence, males in a group are more likely to be related and have closer bonds than females. The strongest social bonds are formed between females and their young offspring.

When a spider monkey sees a human approaching, it barks loudly similar to a dog. When a monkey is approached, it climbs to the end of the branch it is on and shakes it vigorously to scare away the possible threat.

It shakes the branches with its feet, hands, or a combination while hanging from its tail. It may also scratch its limbs or body with various parts of its hands and feet.

Seated monkeys may sway and make noise. Males and occasionally adult females growl menacingly at the approach of a human. If the pursuer continues to advance, the monkeys often break off live or dead tree limbs weighing up to 4 kilograms 8. They do not actually throw the branches, but twist to cause the branch to fall closer to the threat.

Groups are thought to be directed by a lead female, which is responsible for planning an efficient feeding route each day.

Grooming is not as important to social interaction, owing perhaps to a lack of thumbs. This requires the monkeys to remember when and where fruit can be found. The slow development may also play a role: the monkeys may live from 20 [33] to 27 years or more, and females give birth once every 17 to 45 months.

The diets of spider monkeys consist of about 70 to 85 percent of fruits and nuts. They eat the fruits of many big forest trees, and because they swallow fruits whole, the seeds are eventually excreted and fertilized by the feces. Studies show the diet of spider monkeys changes their reproductive, social, and physical behavioral patterns.

Most feeding happens from dawn to 10 am. Afterward, the adults rest while the young play. Through the rest of the day, they may feed infrequently until around 10 pm. If food is scarce, they may eat insects , leaves, bird eggs, bark and honey. If she cannot find enough food for the group, it splits into smaller groups that forage separately.

Each group is closely associated with its territory. Reproduction The female chooses a male from her group for mating. Both males and females use "anogenital sniffing" to check their mates for readiness for copulation. The gestation period ranges from to days. Each female bears only one offspring on average, every three to four years.

A mother carries her infant around her belly for the first month after birth. After this, she carries it on her lower back. They have been seen grabbing their young and putting them on their backs for protection and to help them navigate from tree to tree.

They help the more independent young to cross by pulling branches closer together. Mothers also groom their young. Male spider monkeys are one of the few primates who do not have a baculum.

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L’atèle à tête brune

Living on the ground. Reproduction in two species of spider monkeys, Ateles fusciceps and Ateles geoffroyi. Journal of mammalogy, 54 4 : Felton, A. Felton, J. Wood, D.

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Ateles chamek

It has four elongated fingers and virtually no thumb, which is typical for spider monkeys but unusual for other monkeys. It can move easily through the trees and it has a prehensile tail like other species in the genus Ateles, which it uses to assist with brachiation. It has a life span of up to 20 years. They live primarily in lowland forests, occupying the canopy and the sub-canopy, but they have been observed using various habitat types, including dry and hilly areas such as the piedmont and cerrado forests, and have been observed to move depending on food availability. They live in territorial bands of individuals whose territory covers about 20 square kilometers. It has to contest with other spider monkeys, woolly monkeys , and howler monkeys for food and territory.

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