No one had ever found a preserved keratin sheath from such a large theropod dinosaur before, Kobayashi says. The fact that the reptiles came in two- and three-clawed forms, similar to sloths ...

Many major groups of dinosaurs emerged during this period, including massive sauropods like cetiosaurs and brachiosaurs, sharp-toothed theropods like megalosaurs, and some early ornithopods ...

The oviraptorosaurs lived during the Cretaceous period (between 145 and 66 million years ago) and belonged to a group of dinosaurs called theropods. This is a group of mainly meat-eating dinosaurs ...

Yoshi Kobayashi, Hokkaido University Researchers believe the dinosaur weighed approximately 260kg Therizinosaurs were a group of either herbivorous or omnivorous theropod dinosaurs that lived in ...

Animation of a theropod dinosaur skull, showing muscle forces. Credit: Alec Wilken, Casey Holiday Modern birds, as well as other animals like snakes and fishes, have skulls with jaws and palates ...

Despite being part of the theropod group of dinosaurs — typically associated with carnivorous dinosaurs like Tyrannosaurus rex — therizinosaurs were herbivorous. These dinosaurs are known for ...

Therizinosaurs were a group of either herbivorous or omnivorous theropod dinosaurs that lived in Asia and North America during the Cretaceous Period, which began 145 million years ago and ended 66 ...