. Finger monkeys, also known as pygmy marmosets, are one of the smallest primates in the world.
They typically grow to about five inches in length, with a tail length of approximately double that. They are about the size of a human finger, hence their common name. On average, they weigh between 120–140 grams, and can reach up to 180 grams when fully grown.
Though small in size, finger monkeys are extremely active primates that require specialized care and frequent social interaction to remain emotionally healthy.