Yes, a monkey is classified as a mammal. Mammals are a group of animals that share certain characteristics, such as having hair or fur, and most importantly, being warm-blooded.
Monkeys belong to the primate order, which includes other animals like apes and humans. Like all mammals, monkeys give birth to live young and the females produce milk to nourish their offspring. This is a defining trait of mammals.
Furthermore, monkeys exhibit various behaviors and adaptations typical of mammals, such as social structures, communication methods, and complex brain functions. In summary, monkeys are indeed mammals, with their unique traits and behaviors contributing to the rich diversity of this group.