Sparring Clark's Nutcrackers (IMAGE) The Institute for Bird Populations Caption Two Clark's Nutcrackers spar in the Pacific Northwest. Credit Mandy Holmgren Usage Restrictions Credit photo to Mandy Holmgren 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.