Unlimited Access. Try it Today! Your First 10 Days Always $0.99

Blueprint for a predator

The Raptorex kriegsteini is a 9-foot-long, 150-pound look-alike of the 43-foot-long, 13,000 pound Tyrannosaurus rex. University of Chicago paleontologist Paul Sereno calls Raptorex a "blueprint for a predator," sporting a huge head measuring 40 percent of its body length, powerful jaws,... Tribune photo by Nancy Stone