Enhancing bird diversity with gardening. (IMAGE) USDA Forest Service - Northern Research Station Caption A USDA Forest Service scientist was part of a team that explored the value of the biggest chunk of green space found in cities - residential yards - as wildlife habitat. Photo shows coreopsis, bee balm, and purple coneflower near a residential mailbox. Credit Photo by David Mizejewski, National Wildlife Federation. Usage Restrictions Used with permission. License Original 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.