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Capuchin Monkey Research Paper

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The capuchin monkey is a New World monkey that belongs in the subfamily Cebinae. An adult capuchin monkey can grow anywhere between 12.6 to 22 inches in height excluding the tail, which can be anywhere from 15 to 22 inches in length. On average a capuchin monkey will have a body mass ranging from 2.4 to 7.3 pounds. Like all new world monkeys, the capuchin monkey has a 2:1:3:3 dental formulas which indicates that it has two incisors, one canine three premolars and three molars. Interestingly, the brain size of a capuchin monkeys is slightly larger than that of other new world monkeys. On average, male’s heads are larger than females, in fact they are 34% larger in body size and have canines that are 22% sharper than females . Capuchin monkeys…show more content…
An observational study conducted, concluded that wild capuchins use anvils and stone pounding tools as a means to facilitate nut-cracking . In the study, a group of ten wild capuchin monkeys where observed in a habitat that is scarce in food, aside from palms. There are different types of palm nuts, larger ones with an oval shape and smaller ones that are as small as 2.5 to 3 cm in diameter. It is interesting to note that many different anvil sites were observed, and what is more interesting is that on the anvil sites, river pebbles were seen and since these are not usually found in the area, it can be assumed that capuchins transport their stones to the anvil sites. An abundance of palms, yet otherwise limited food, has contributed to tool use for nut-cracking becoming a common routine. As a result of the study, wild capuchins were directly observed using anvils as tools for stone pounding. Additionally, characteristic depressions on anvils as well as palm shells and stone pounding tools leftovers indicate nut-cracking. Capuchin monkey choose anvil sites that provide a flat surface to facilitate nut-cracking, often the anvils used by capuchins are made of sandstone or siltstone, but they can also be boulders and fallen trees Essentially anything in the capuchin’s vicinity, that could provide a suitable substrate. When capuchins crack palm nuts, they typically hold the selected stone using both hands and stand in a bipedal…show more content…
One study attempted to observe capuchin monkey’s ability to recognize cause and effect relationship in regards to tool use. An article in the international journal or primatology by Anthea Lavallee, describes the tests she conducted in a captive naturalistic environment on capuchin monkeys, as she writes, “I tested tufted capuchins' ability to conceive solutions to a probing task in a naturalistic captive setting” . The results showed at 3 out of the 5 capuchin monkeys displayed an ability to make and use tools that were presented to them from a wide variety of natural materials presented. Another study on the manipulation and tool use in captive yellow breasted capuchin monkeys was published in the “International Journal of Comparative Psychology” . This experiment consisted of six capuchin monkeys, who were placed in an environment where their tool using was tested and observed. The tools that were made available to the monkeys were transparent 9mm Plexiglas boxes with 3mm Plexiglas lids as well as different size stones. A piece of food was then placed into the box with the stones next to it and left for the capuchins. Each test subject was left isolated with the tools and box from the other test subjects, the subjects where successful if they used the stones to try and
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