Here's why:
* High canopy dwellers: Spider monkeys are highly arboreal, meaning they spend most of their time in trees.
* Long limbs and prehensile tails: Their long limbs and prehensile tails allow them to move effortlessly through the canopy, even reaching the tallest trees.
* Food sources: The emergent layer provides access to a variety of fruits, leaves, and insects that make up their diet.
* Predator avoidance: The emergent layer offers a safe haven from terrestrial predators and other dangers.
However, it's important to note that they are not exclusively found in the emergent layer. They can also be found in the canopy and understory layers of the rainforest, depending on the availability of food and resources.