Here's why:
* Size Variation: Monkeys come in a wide range of sizes, from the tiny marmosets (some are even smaller than squirrels) to the large baboons.
* Species Diversity: There are over 260 species of monkeys, each with its own unique size and appearance.
Instead of a specific name, you could describe the monkey you're thinking of based on its:
* Size: "A small monkey", "a tiny monkey", "a monkey about the size of a squirrel"
* Species: "A marmoset", "a tamarind", "a pygmy monkey"
Let me know if you have a specific species or type of monkey in mind, and I can help you find a more specific name!