Squirrel monkeys are small primates belonging to the genus Saimiri. They are native to the tropical forests of Central and South America. Here’s a description of their distribution by country:

1. Brazil: Squirrel monkeys are found in various parts of Brazil, particularly in the Amazon rainforest and other forested areas across the country.
2. Peru: Squirrel monkeys inhabit parts of Peru, including the Amazon basin and other forested regions in the eastern part of the country.
3. Colombia: Squirrel monkeys are native to Colombia, where they are found in the Amazon rainforest and other forested habitats in the western and southern parts of the country.
4. Ecuador: Squirrel monkeys are also found in Ecuador, particularly in the Amazon region and other forested areas in the eastern part of the country.
5. Bolivia: Squirrel monkeys inhabit certain parts of Bolivia, including the Amazon basin and other forested regions in the northern and eastern parts of the country.
6. Venezuela: Squirrel monkeys are native to Venezuela, where they are found in the Amazon rainforest and other forested areas in the southern and eastern parts of the country.
7. Guyana: Squirrel monkeys are found in Guyana, particularly in the Amazon rainforest and other forested habitats in the southern part of the country.
8. Suriname: Squirrel monkeys inhabit parts of Suriname, including the Amazon basin and other forested regions in the southern and eastern parts of the country.

Squirrel monkeys are highly adaptable and can inhabit a variety of forested habitats, including primary and secondary forests, flooded forests, and mangrove swamps. They are primarily arboreal, spending most of their time in the trees, where they forage for fruits, insects, and other small prey. Squirrel monkeys are known for their high-pitched vocalizations and social behavior, often living in groups known as troops. They are an important part of the ecosystem in their range and play a role in seed dispersal and insect control.