This thesis deals with a study on the ability of Rana pipiens and Rana clamitans to perceive acoustic stimuli. The research has been carried out in three parts: conditioning to sound; recording of the respiratory rate in response to sound; observation on the threshold of sound perception. A review of the available literature on hearing in frogs, a description of the methods used and the results obtained are presented, followed by a general discussion and conclusions. / Thesis / Master of Science (MSc)