However, the actual hunting habit of this new species is unknown.
Sterling Nesbitt is the one that had found a set of bones in 1998 at the age of 16 years when he was a volunteer in New Mexico.
Still, he says, the dinosaur "gives us a glimpse into the evolution of tyrannosaurs just before they take over the planet".
The new dinosaur seems to represent an intermediate phase in tyrannosaur evolution, according to the study authors. It was not as small as the oldest tyrannosaurs, but it was considerably smaller than the T. rex, which could reach a weight of nine tons and boasted a skull that was about the same length as Suskityrannus' entire body.
The North American fossil record of dinosaurs from approximately 90 million years ago (Late Cretaceous) is one of the most poorly sampled and least understood times of the Cretaceous Period.
A tiny 3-foot-tall relative of the Tyrannosaurus rex has been discovered and named. Unfortunately, for about two decades, scientists haven't known many details about the bones - the story changes when other small cousins of T-Rex have been discovered.
"I was very excited, but also a little bit nervous because I had to pick up every fragment", said Nesbitt.
Scientists have discovered a new relative of the Tyrannosaurus rex which is much smaller than the huge, ferocious dinosaur made famous in countless books and films, including Jurassic Park. The second one was more complete and was found and built by Nesbitt, was a high school junior then. Skeletal parts of two individuals of the new species had already been more than 20 years ago in the Zuni basin in the US state of New Mexico found, as it is said in a communication to the Virginia Tech University.
For much of the 20 years since the fossils were uncovered, the science team did not know what they had.
"My discovery of a partial skeleton of Suskityrannus put me onto a scientific journey that has framed my career", said Nesbitt, in a press release.
Nesbitt will be driving the specimen across the country to Arizona this summer.