Final answer:
For Sandy to set up a suitable habitat for howler monkeys, she needs to include various climbing structures that simulate a tree-rich environment and a large feeding area to mimic natural foraging, while avoiding unnecessary features like a swimming pool and concrete flooring.
Step-by-step explanation:
To create a suitable habitat for howler monkeys at the zoo, Sandy should include a variety of climbing structures. According to the information provided, zoos should replicate animals' natural environments; since howler monkeys are arboreal, living in trees, they need structures to climb. This simulates their natural habitat, which is essential for their health and well-being. Consequently, climbing structures such as tree hollows, branches, and specimen rainforest trees must be incorporated into the design of their enclosure. A swimming pool is not necessary, as they are not known to be aquatic creatures like some other primates. Also, a large feeding area would be appropriate, as it can mimic the foraging behaviors howler monkeys would exhibit in the wild. Concrete flooring would not be ideal for an animal that is adapted to a forest floor covered with leaves and soil; a natural substrate would be better.