Albino Pygmy Marmoset monkey perches on a zookeeper's thumb at Froso Zoo in Ostersund, Sweden August 22, 2006. 
The Pygmy Marmoset, which lives in the upper Amazon basin in South America, is the world's smallest monkey and reaches 35 cm ( 13.7 inches) in length and weighs up to 100 grams (3.5 ounces) at maturity.
The Pygmy Marmoset, which lives in the upper Amazon basin in South America, is the world's smallest monkey and reaches 35 cm ( 13.7 inches) in length and weighs up to 100 grams (3.5 ounces) at maturity. 
