Bird Song, Before Deafness (audio) Duke University Medical Center Loading audio... Caption This bird (a male, because only male zebra finches sing) was around 90 days post hatch (dph) when he became deaf. This is around the age at which zebra finches sexually mature, so he is considered a young adult. This is the .wav file of his pre-deafening song. Credit Katie Tschida, Duke Department of Neurobiology Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.