Pigeon Study Takes on Sexism in Science (IMAGE) University of California - Davis Caption Scientific studies have a bias towards using male subjects. UC Davis biologist Rebecca Calisi is studying differences between male and female pigeons (rock doves) to make the case for more inclusive studies. A baseline study shows major differences in gene expression in the hypothalamus and pituitary between male and female pigeons. Credit Gregory Urquiaga/UC Davis Usage Restrictions May be used with acknowledgment. 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.