Contact: Greg Borzo 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 Related news release: Study
unravels why certain fishes went extinct 65 million years ago