Pygmy Marmoset is the smallest monkey in the world that weighs around 100 grams (3.5 oz). People call him by various names like Pocket Monkey, Dwarf Monkeya and Little Lion. They are mostly seen in groups of 12 members in the South American rainforests of western Amazon Basin.
Pygmy Marmoset loves spending time together and they are pretty close to their peers. Pygmy Marmoset is born in sets of twins but few mothers give even birth to three or four babies at a time.
Source: Our Funny Little Site