Photo of Threatening Mask (IMAGE) University of Washington Caption Ila Palmquist, a member of John Marzluff's laboratory group, wears a threatening mask while catching and handling crows. The mask carries a neutral expression so the associations made by the crows was based on their treatment. Credit Marzluff Lab/U of Washington Usage Restrictions Credit required 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.