Species Name: Ateles fusciceps
The black-headed spider monkey is a species of New-World monkey native to Central and South America. The species name "Ateles" is derived from the Greek word "ateleia" meaning imperfect or incomplete. It was likely chosen because these monkeys do not have a thumb.
Species Name: Cacajao calvus
The bald uakari is an Amazon primate with special traits: it has a glossy red bald face, a short tail, and reddish fur. This monkey is highly specialized and is mainly found in palm habitats. The conspicuous crimson color is caused by blood flow under the skin, specifically a thinner epidermis with a higher concentration of capillaries on the face.
Species Name: Leontocebus leucogenys
The Andean saddle tamarin, also known as the saddleback tamarin (formerly known as the brown-mantled tamarin), is a New World monkey species. Andean saddleback monkeys are considered "phyletic dwarfs," meaning their small size is related to their evolutionary development.