Primate Essays

Evolution of Orangutans

Orangutans are apes with reddish-brown hair that originated 2 million-100,000 years ago. Orangutans are categorized the Hominidae family, which is commonly known as the Great Apes. Orangutans live in Asia, only found on the islands of Sumatra and Borneo. They are known for their long arms which can reach to a length of 7m, fingertip to fingertip (See Appendix A, Fig. 1). There is no real evidence of who the orangutan’s ancestors were. The primate lineage was thought to start…

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Bengal Slow Loris_ Reasons for Endangerment

The Bengal Slow Loris (Nycticebus coucang) are unique nocturnal primates with them being the largest size of their species and their weight is usually 1100g to 1,600g. They like to reside in many locations such as tropical rainforest, seasonal evergreen forest, deciduous tropical forest, sub-tropical hill forest, savannah, swamps and many more habitats! Many of these habitats are located in north-eastern India, Bangladesh, Vietnam, southern China and Thailand. Their appearance does not differ, both having a white stripe coming down…

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Golden Snub Nosed Monkey

If you visit Qinling Mountain and walk through the forests, you may see some golden figure swinging from trees to trees. They are golden snub-nosed monkeys, which I think are the most beautiful kind of primates in the world. Golden snub-nosed monkeys are famous for their golden hair and pale blue faces. Another obvious characteristic of this kind of monkeys is that there are no bones in their noses. With these features, you can easily recognize them. Golden snub-nosed monkeys…

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Self Control and Tool Use in Tufted Capuchin Monkeys

Self-control is defined as forgoing immediate gratification to obtain a greater rewards…These results indicate that capuchins are capable of delaying gratification when a higher quality reinforcer is present and that tool experience can influence levels of control in this task. Self-control and Tool Use in Tufted Capuchin Monkeys (Cebus Apella) Introduction Self-control can be operationally defined as choosing to forgo immediate gratification in order to obtain a more valuable, but delayed reward (Mischel, 1974)…The goal of our study was to…

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