"Binocular vision requires eyes set slightly apart that have overlapping fields of view, meaning the same eye sees the same thing at the same time from a slightly different perspective," Loewen explained. "This allows the animal to have depth perception."
Although T. rex emerged some 10 million years after Lythronax, both lived at a place called Laramidia, which existed along the western shores of a great seaway that separated North America. The tyrannosaurid dinosaurs likely evolved in isolation on the island continent, with incursions of the seaway separating small areas of land from each other. This further allowed different species of dinosaurs to evolve on different parts of the landmass.
Sertich explained that rising mountains and fluctuating sea levels made for a very dynamic landscape, which set the stage for the evolution of unique dinosaurs and their ecosystems.
"Laramidia over its history was a paradise of dinosaur evolution," Loewen said. "Many groups, including ankylosaurs, ceratopsians, hadrosaurs, ornithomimids and tyrannosaurs underwent radiations on this island continent. In some ways, it was the crucible of evolution during the Late Cretaceous."