Swordfishes (IMAGE) University of Chicago Medical Center Caption The fossil fish on the left is not related to the modern swordfish on the right, which is for sale at a fish market. Nevertheless, the swordfish developed a size and shape similar to the fossil fish and appears to be vulnerable to extinction for some of the same reasons that the fossil form was vulnerable: it is a large predator. Credit Photo by Matt Friedman Usage Restrictions None 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.