Here's why:
* Tiny Size: Adults typically measure just 5-6 inches (12.7-15.2 cm) tall and weigh a mere 4-5 ounces (113-142 grams).
* Smallest Primate: They're actually the smallest primates in the world!
* Native to South America: They live in the rainforests of the Amazon basin, specifically in Western Amazonia.
Fun Fact: These miniature monkeys have an incredibly fast metabolism and require a diet rich in insects, tree sap, and fruits.