* Eukaryotic: Spider monkeys, like all animals, have cells with a nucleus and other membrane-bound organelles.
* Multicellular: They are composed of many different types of cells that work together to form tissues, organs, and organ systems.
* Heterotrophic: They cannot produce their own food and must consume other organisms for energy.
* Motile: Spider monkeys can move independently, unlike plants.
* Reproduce sexually: They produce offspring through the fusion of gametes (sperm and egg).
These defining characteristics clearly place spider monkeys within the kingdom Animalia, rather than in other kingdoms like Plantae, Fungi, or Protista.