Extracting the strontium from the wings (IMAGE) University of Ottawa Caption One of the first steps is to extract the strontium from the butterfly wings, which digest in nitric acid. Credit Megan Reich, University of Ottawa 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.