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Researchers surveyed more than 2,000 dinosaur bones from the Jurassic Mygatt-Moore Quarry, a 152-million-year-old fossil deposit in western Colorado, looking for bite marks. They found more than they were expecting. Big theropod dinosaurs such as Allosaurus and Ceratosaurus ate pretty much everything - including each other... There were theropod bites on the large-bodied sauropods, whose gigantic bones dominate the assemblage, bites on the heavily armored Mymoorapelta, and lots of bites on theropods too, especially the common remains of Allosaurus. There were hundreds of them, in frequencies far above the norm for dinosaur-dominated fossil sites. Some were on meaty bones like...

Discovered in the early 80s, the Ellisdale fossil site of New Jersey has become well-known for preserving an unusually complete record of terrestrial animals from the eastern coast of North America from 75 million years ago, when the continent was divided as two landmasses by a large interior sea. Yet, the dinosaur fossils of the site have never been formally described. Since 2014, researcher Chase Brownstein of the Stamford Museum and Nature Center has been tracking down elusive eastern North American dinosaurs.Recently, Brownstein has been working on describing the ample assemblage of bones from one group of dinosaurs, the theropods,...

MONDAY, Oct. 10 (HealthDay News) -- Head to the American Museum of Natural History's Web site, and you'll see the major draw this fall is a splashy exhibit on dinosaurs. And not just any dinosaurs, but two-legged carnivorous, feathered "theropods" like the 30-inch-tall Bambiraptor -- somewhat less cuddly than its namesake. The heyday of the theropods, which included scaly terrors like T. rex and velociraptor, stretched from the late Triassic (220 million years ago) to the late Cretaceous (65 million years ago) periods.