City bird with food. (image) Forschungsverbund Berlin Share Print E-Mail Caption Abundance of prey species is key to bird diversity in cities. Credit Till Kottmann/Unsplash Usage Restrictions The image may only be used with appropriate caption and credit. Share Print E-Mail 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.