Squirrel Tamarin : A New World Monkey

As part of the only Old World Monkey group I analyzed the Silver Langur whose scientific name is Trachypitneus Cristatus. In this cage there was a total of 6 monkeys so there was very much activity. This

A few weeks ago, I spent a lovely Monday afternoon observing two different primates at the Santa Ana Zoo. I got to the zoo around two in the afternoon, and to my surprise, the zoo was decently crowded. The Santa Ana Zoo is smaller in comparison to other zoos like the Los Angeles Zoo, but still had a decent amount of animals there. Covering a small 20 acres of land, I came across two primates that fit perfectly for the purposes of this course project. I chose to observe an endangered ape, the white-handed gibbon, and an endangered new world monkey, the golden-headed lion tamarin.

Various experiments and measurements were performed in the field in order to compare the two types of rodents. The following is a list of the data collected through multiple observations over a span of two years. We captured 100 rats of each rodent population, and we found the average weight, length, hind limb, and forelimb measurements. In addition, we conducted experiments in regards to their top speed, average height that they could leap, gestation time, and average time spent in the courtship display.

Primates are one of the most interesting mammals on earth, not only because of their complex social structures, but because they hold so many similar characteristics to humans. Primates are often cited as our closest living relatives and on two separate occasions I observed four separate species of primates at the San Diego Zoo that can justify their use of their physical characteristics and behaviors that may be similar as well as different to the other primates and ours.

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

Isbell and Wright’s articles both focus on monkey species and their native environments, Africa for Isbell’s (1994) vervet Old World monkey and South America, Peru area, for Wright’s (1994) owl and titis monkeys. The articles main focus is the relationship between these monkeys and their natural predators. Focusing on how the predator aspect of their lives is determined by their environment and adaptations they make to ensure survival. Isbell’s Vervets Year of Doom focuses more on the adaptations that was forced upon the vervets’ because of their changing environment, the death of fever trees. While Wright’s Night Watch on the Amazon focusses more on how the primates way of life affects their relationship with predators and the likelihood of attacks. Both articles have similar aspects however the species way of life, specifically their environment and sleep schedule, are quite different as well as the authors way of observing and studying the primates within their habitats.

The observations of Common Squirrel Monkey (Saimiri sciureus) and Western Gorillas (Gorilla Gorillas) were made on 31th October, 2015 at the San Francisco Zoo where is located on 1 Zoo Road San Francisco, CA 9413. The observations has lasted about 3 hours, from 1:40 pm – 4:40 pm, and each primate has been observing for around 1 to 2 hours. Common Squirrel monkey is a small new

The first focal animal I chose to observe was a female adult spider monkey named Gumbelina who was sitting with a few of the other monkeys that were all sitting and grooming each other. She seemed to be very relaxed and won’t

Pointed head, a unique anatomical characteristic of the Gorilla. This is attributed in the adult male to a prominent sagittal crest overlaid with a pad of fibro fatty tissue. This characteristic is less pronounced in females and smaller bodied adult males. Extreme muscularity. Broad, flat face. Jaw that protrudes beyond the nose. This anatomical feature (prognathism) is distinctly ape-like. Prognathism is due to the need for large jaws and teeth for mastication. Brow-ridges, above the eyes is a huge shelf of bone. Hair color is most often described as light brown, dark brown or black. Other colors that have been reported are grey, light, white, silver-tipped, and red to reddish-brown. Hair length is longer on the head, shoulders, and arms, than anywhere else on the body. Hair distribution, body is completely hair covered except for patches of bare black skin on the face, chest, soles of feet, and palms of hands. There have been reported attacks on humans but they cannot be proved. Stories of an ape like creature roaming the forests of North America have been around as long as some of the Native Americans tribes started in certain areas, due to the finding of cave painting of sasquatches. However, the earliest written account was made in 1811.

This project pertains to the pygathrix cinerea or which it is more commonly know as the grey- shanked douc Monkey . It falls under the animalia kingdom, the chordata phylum, the mammalia class, the primates order, and the cercopithecidae family, the pygathrix genus,and the pygathrix nemaues species ( http://www.departments.bucknell.edu ). The body, and the majority of the arms, and lower legs are light grey with a paler underside, and their shoulders, upper legs, and part of their buttocks are marked with white patches. Their feet and hands are black while having the bare skin on their face being yellowish brown, and the areas around the mouth and chin which is white. Long white fur borders the sides of their face with a slanting eye, and their throats are white with an orange collar encircled

The second grade of primates evolved about 53 million years ago, in Eocene epoch. There are five tarsier species that all live in the islands of Southeast Asia, where they inhabit from tropical forest to backyard gardens (Jurmain, et al, 2011). They are considered to be closely related to lemurs and lorises (prosimian family) for the several traits that they share with Grade I primates while having some anthropoid features as well. However, tarsiers have distinctive characteristics that isolate them from other primates. They are categorized as the smallest creatures among the primate species and they are well known for their enormous eyes which is as large as its brain. They are normally nocturnal insectivores but sometimes carnivorous. They catch insects by jumping at them and as they jump from tree to tree, they even hunt for birds while in motion.

Capuchin Monkeys are found in the neotropical forests of Central America. Animal Diversity Web states that the Capuchins have, "one of the widest ranges of all New World Monkeys. " Capuchin Monkeys are easily adaptable to many different habitats. They can live in a variety of forest types, both wet and dry. The University of Wisconsin Primate Research Center notes that, "All Capuchins live in dense habitats. They are arboreal and usually sleep on a branch. " This being said they can survive in an abundance of areas because of their some special features. These features include strong gripping hands and a grasping tail, giving these monkeys have a wide range of locomotion. They are able to run, leap, and

According to the data collected, the Intermembral index for each of the six primates observed from highest to lowest is: Gibbon (127), Howler monkey (102), Baboon (94), Macaque (89), Marmoset (74), Human (69). From this grouping, the Gibbon is the primate whose IM at 127 is the highest percentage, and this indicates that their upper limbs are significantly longer than their lower limbs. In contrast, the Human, with an IM of only 69 serves as the lowest percentage of the examples given, and this instead serves to demonstrate that their upper limbs are shorter than their lower limbs. This difference in limb length between the Gibbon and the Human is significant because it helps to show how species are adapted to best fit the environments

On Friday, March 31, a observation study was conducted at the L.A. Zoo. The time of arrival for the observation was at 11:48 am and the end of the observation was at 2:42 pm. The weather condition at the zoo was very sunny with a mild gust of wind every so often, which is a perfect weather condition to conduct a study. The main reason for conducting this observation study was to study and gather information about the many different types of primate that are located at the zoo. To see how different or similar each primate is to one anotherin different aspects.

Kavanagh, M. & Morris, D. (1983). Complete guide to monkeys, apes and other primates. London: Viking Press.