Book Cover (image) University of California - Riverside Share Print E-Mail Caption This image shows the front cover of the book "Odd Couples: Extraordinary Differences between the Sexes in the Animal Kingdom." Credit Princeton University Press. Usage Restrictions None 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.