Environmental factors play a role in communication by affecting the frequency of the signal and how far the signal can travel and still be audible to communicate the desired message. Since the pygmy marmoset is often found in the rain forest, plant life and the humid atmosphere add to the normal absorption and scattering of sound. Because low frequency calls are affected less by the disturbances than their high frequency counterparts, they are used for communication across longer distances.[1] The pygmy marmoset changes the characteristics of its calls when its social environment is changed.