This one-of-a-kind compendium features more than 3,000 records, covers some 750 theropod
species, and includes a wealth of illustrations ranging from diagrams and technical drawings to full-color reconstructions of specimens, says a review on the Princeton University Press website.
These results of the proportions of the hindlimbs of these different groups show that as the length of the femur increases, the length of the lower leg increases similarly in felines, ungulates and non-avian theropods
, and significantly different than in existing and extinct cursorial birds (Table I).
The small ornithopod and theropod
footprints were clearly made by very similar (if not identical) trackmakers to those preserved at Dinosaur Stampede National Monument, which is located about 100km south of this site, he said.
Using techniques like CT scans, modem paleontologists can compare the braincases of modern birds to their relatives, including theropod
"There, laid out on the table, was the most beautiful little theropod
dinosaur ever found in Europe.
"Just a decade ago, no one would have imagined that theropod
dinosaurs, Earth's quintessential predators, would turn out to be one of the best evolutionary case studies for how animals adapt to plant-based diets," Zanno says.
Chilesaurus is the first herbivorous theropod
, a lineage that includes mainly predatory dinosaurs, from the southern hemisphere."
Chilesaurus diegosuarezi had a bird-like beak with leaf-shaped teeth, evidence that it feasted on plants, but with hind leg features similar to theropod
dinosaurs, the group into which it was slotted with notorious killers like T.
Using tools normally employed to study the evolution of viruses, the team looked at 1,500 body traits across 120 species of theropod
and early birds.
Therizinosaurs, lived about 70 million years ago, and had huge, round guts; stumpy legs; a long neck; and a turtlelike head and beak, and were herbivores despite being members of the carnivorous group known as theropods
Palaeontologist John Ostrom's work in the 1970s describing the dinosaurian "raptor" Deinonychus reopened the debate with new evidence that supported a theropod
ancestry for birds.
gave rise to modern birds and included famous names such as Tyrannosaurus rex and Velociraptor.