Abstract
Two types of mechanosensitive units have been found in the skin of the upper bill and in the tongue of the domestic duck: vibration-sensitive and vibration-insensitive. They both were not spontaneously active and they both adapted rapidly to mechanical stimuli. The first type of units seems to correspond to Pacinian-like structures,i. e. Herbst corpuscles. There is no convincing evidence for or against the relationship between vibration-insensitive units and Grandry corpuscles.
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