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teeth grate against each other (Burkenroad, 1930). The author noted that produce grating sounds when they are held both in and out of the water, ithe floor. All electrical devices were switched off during the recordings.teeth grate against each other ( Burkenroad, 1930 ). The author noted that produce grating sounds when they are held both in and out of the water, ithe floor. All electrical devices were switched off during the