Northern Cardinal (IMAGE) California Polytechnic State University Caption The northern cardinal has a relatively low frequency song and delayed breeding in response to noise pollution. Credit David Keeling Usage Restrictions Image may only be used with appropriate caption and credit. License Licensed content 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.