What are the spider monkeys relatives?

Spider monkeys are part of the family Atelidae, which encompasses all the New World monkeys with prehensile tails.

Within Atelidae, they belong to the subfamily Atelinae, alongside other monkeys with prehensile tails like:

* Howler monkeys: Known for their loud, booming calls.

* Woolly monkeys: Have long, thick fur, making them appear fluffy.

* Muriquis: The largest New World monkeys and are known for their peaceful nature.

So, in short, spider monkeys' closest relatives are the other monkeys within the Atelinae subfamily.