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Why do monkeys have opposible thumbs

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326 17.07.2019
Monkeys make up a large group of intelligent primates that live in Asia, Africa, Central and South America, and many island countries. Monkeys are known for climbing trees and swinging from branches, often using their long tails. There are two main types of monkeys, Old World and New World monkeys. Most monkeys have opposable thumbs, which are the types of thumbs humans have.
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Opposable thumb

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Primate - Wikipedia

Hand evolution The development of an opposable thumb that enables humans to grip and manipulate objects is widely believed to give us an evolutionary edge. But new research finds that human hands are more primitive than those of our closest primate ancestors chimpanzees. The study, published in the the journal Nature Communications , found that human hand proportions have changed little from those of the last common ancestor of chimps and humans, while the hands of chimps and orangutans have evolved quite a bit. Conversely, chimp hands are much longer and narrower. Since the thumb is not as long, it just meets up with the palm, while the chimp's other four fingers extend upward. As a result, chimps and orangutans do not have opposable thumbs as we do.
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Do all primates have opposable thumbs?

Monkeys live all over the world and come in various shapes, sizes and colors. As one of our closest relatives, these mammals are very intelligent and have opposable thumbs, allowing them to use tools and play games. There are more than different types of monkeys. They are separated into two major categories: New World and Old World. One difference between the two categories is that Old World monkeys don't have prehensile tails; New World monkeys do.
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There are numerous primate species in the world, and they all have thumbs. But the actions and movements these thumbs allow varies as greatly as the species themselves. From grasping, climbing, hanging, peeling, throwing, fishing and even creating tools, having a thumb opens a whole new world of dexterity. Humans rely on their thumbs to pick things up, write things down, button clothing, tie shoes and much more. Nonhuman primates use their thumbs for a range of purposes as well, and different primate species have different kinds of thumbs with varying degrees of dexterity and motion.

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