Paper Wasp Foraging for Sugar (IMAGE) North Carolina State University Caption A paper wasp forages for sugar -- and likely yeast -- on a hummingbird feeder. Wasps like this may be a source of yeast for human applications. Credit Anne A. Madden Usage Restrictions Credit must be given. 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.