21 November 2006 Current Biology cover (image) Cell Press Caption Imoso, the highest-ranking male in the Kanyawara community of Kibale National Park, Uganda, grooms Outamba, a middle-aged female. Male chimpanzees at Kanyawara consistently prefer the oldest females in their community as mating partners, suggesting that the preference that human men exhibit for youthful women is a recent evolutionary phenomenon. For more information, see the Report by Muller et al. in the November 21 Current Biology. Credit Photograph by Jean-Michel Krief Usage Restrictions This image may only be used to illustrate a news item about research published in this specific issue. This image may not be altered or cropped without advance permission. If you have questions or concerns, please contact Heidi Hardman at 617-397-2879 or mailto:email@example.com. 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.