Chéngnián mǔzhǐhóu de tǐzhòng dàyuē zhǐ yǒu yì bǎi kè.
An adult pygmy marmoset weighs only about 100 grams.
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Literally 'thumb monkey' — an adult is small enough to sit comfortably on a human thumb. Native to the western Amazon, it feeds mainly on tree sap by gnawing holes in bark and licking the exudate.
