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Thumbs and Fingers
New World Monkeys, including the spider monkeys, do not have thumbs. Squirrel monkeys and Capuchins have pseudo-opposable thumbs. They are the only New World Monkeys of this type.
Largest and Smallest
The Pygmy Marmoset is the world’s smallest monkey, according to sources. It weighs 85 to 140 grams and measures 117-159 millimeters. On the other hand, the largest monkey is the male Mandrill, which weighs almost 35 kilograms and is 1 meter long.
