A 2014 study shows that "Dimetrodon" was in an arms race against its prey. The smaller species, "D. milleri", had no serrations since it ate small prey. As prey grew larger, several "Dimetrodon" species started developing serrations on their teeth and increasing in size. For instance, "D. limbatus" had enamel serrations that helped it cut through flesh (which were similar to the serrations that can be found on "Secodontosaurus"). The second largest species, "D. grandis", has denticle serrations similar to those of sharks and theropod dinosaurs, making its teeth even more specialized for slicing through flesh. This study demonstrates that, as "Dimetrodon"'s prey grew larger, the various species responded by evolving into larger sizes and developing ever-sharper teeth.