Pear Trees (IMAGE) University of Cincinnati Caption A northern mockingbird sits in a flowering pear tree. University of Cincinnati biologist Theresa Culley says birds disperse the seeds of pear trees into forests where they outcompete native trees. Credit Michael Miller Usage Restrictions None 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.