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These different fossils show many similarities with each other, especially in the skull bone.

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All three of these seemingly different New World Monkeys display their relation to each other based off of how they have adapted with certain traits. One of the more striking similarities is how they have evolved to communicate. The tamarin Monkeys and Spider Monkeys simply communicate through using their mouth and certain sounds and calls, while the Spider Monkey has adapted to communicate through using physical movement.

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Zhaotong

6 million years old

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Antillothrix

1 million years old

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Adapidae
47 million years old

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Leontopithecus rosalia

2002-15years

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The Emperor Tamarin Monkey reaches a length of 24 to 26 centimetres and has a 35 centimetre long tail. It weighs around 300 to 400 grams. The Emperor Tamarin Monkey inhabits tropical rainforests, living deep in the forest and also in open tree-covered areas. The Emperor Tamarin Monkey is a diurnal monkey, spending most of its days in the trees.

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Nostrils are far apart and open to the side

Molars are relatively large

Some species (howlers, spiders) have prehensile tails

Male involvement common when it comes to infants

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Many types of New World Monkeys show biological similarities especially through the gene IRBP. and the CD4 and CCR5 proteins are dominate

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New World monkeys are small to mid-sized primates.All New World Monkeys have the ability to use and grip objects with their tails, known as prehensile tails, while their ancestors and other current Old World Monkeys do not have this ability.

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New World Monkeys most likely went through the process of Gradualism while evolving because of their many overlapping traits while still remaining very different from one another. Based on fossil evidence, the sizes and shape of the elongated skulls from their ancestors show striking similarities between them and showing the gradual change in many species with some having smaller and less elongated skulls.

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Howler Monkeys are usually located in Central and South American forests. It has one of the most unique traits of a hyoid bone, allowing it to howl at incredible volumes. The various howls themselves help the monkeys communicate with one another, and are known as one of the loudest animals in the world.

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Spider Monkeys are usually located in tropical forests from Southern Mexico to Brazil in high canopies. Weighing in at an average weight of 24 pounds, Spider monkeys are one of the largest, and most intelligent New World Monkeys. In social groups, they communicate through movement, much like sign language, and can be very verbal.

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Both the howler Monkey and Spider Monkey have strikingly similar embryonic development, such as being in the fetal position and developing a tail.

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Common Name | Simia Paniscus
Kingdom | Anamlia
Phylum | Chordate
Class | mammal
Order | Primate
Family | Atelidae
Genus | Ateles
Species | spidermonkey

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Common Name | Alouatta
Kingdom | Anamlia
Phylum | Chordate
Class | mammal
Order | Primate
Family | Atelidae
Genus | Alouatta
Species | howler monkey

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Catopithecus browni

1993-24 years

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Common Name | Callitrichidae
Kingdom | Animalia
Phylum | chordate
Class | mammal
Order | primate
Family | Callitrichidae
Genus | saguinus
Species  | Tamarin Monkey