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“And it doesn’t get any more diagnostic than that, seeing these giant tyrannosaurus teeth starring back at you.”

Earlier this year, the United States returned dinosaur fossils taken out of Mongolia, including the skull of an alioramus, a smaller version of a tyrannosaurus rex that lived 70 million years ago.

This means that a wide range of iconic dinosaurs were warm-blooded: Velociraptors and tyrannosaurus rexes were theropods, pterodactyls and so-called "monkeydactyls" were pterosaurs, triceratopses and stegosauruses were ornithischia, and brontosauruses and brachiosauruses were sauropods.

New Mexico’s high desert plateaus have also yielded many dinosaur fossils, including various species of tyrannosaurus that roamed the land millions of years ago when it was a tropical rain forest.

As it moved through the toppled trees and standing brush, it mimicked the sound of a tyrannosaurus rex making its way through the jungle in a “Jurassic Park” movie.