A study of clicking and its source in some avian species

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Abstract
An investigation was carried out to study clicking and its source in 12 avian species. Clicking sounds were found to be qualitatively the same for all birds examined although the frequency and the intensity varied. After hatching, the sounds continued in all but one species (e.g. the ringnecked pheasant), and continued for the longest duration in the passerine birds, where it lasted for 5 days. Records were kept of minimum and maximum frequencies of regular clicking sounds. The glottis was observed to be the source of clicking in 9 of the 12 species studied, the results from the three precocial species being inconclusive. The passage of air through the glottis was found to have no bearing on the emission of clicking, but the sounds are related to the events of inspiration and expiration. The clicking sounds may be caused by the movement of cartilage tissue within the glottis.

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