Recent debates have surfaced over the number of horned dinosaur species. Experts like Nicholas Longrich at Yale University believe that while fossils of the triceratops and torosaurus are similar, their differences indicate they are, in fact, two different types of horned dinosaurs. It was previously thought that the torosaurus was the mature version of the triceratops. The experts examined several factors when trying to determine the truth, including whether the two species were present in the same place at the same time. While the debate is still happening, the evidence (and the article) seems to suggest that Longrich's findings are true.
In this article, Longrich is not only employing ethos, but also logos when trying to figure out the truth behind the debate. There are many fact claims present about different aspects about the research, such as differences in the fossils.