The Pygmy Marmoset is the world’s smallest monkey. It measures 117-159 millimeters (four and a half to six inches) in length and weighs 85 to 140 grams (three to five ounces). The pygmy marmoset uses special types of communication to give alerts and warning to its family members. These include chemical, vocal, and physical types of communication. A trill is used to communicate over long distance. A sharp warning whistle and a clicking sound signal danger to their family members. A J-call is a series of fast notes repeated by the caller and is used at medium distances.
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