Kayrasaurus changliensis stretched more than 11 feet and packed over 77 tiny teeth into its jaws, making it the largest therizinosaur yet found in the Early Cretaceous Jehol Biota.
Dinodontosaurus isiyavamanda, a 240-million-year-old tusked herbivore, ties Tanzania's fossil beds to Brazil and Argentina. The rocks that were supposed to hold the earliest dinosaurs can no longer claim the title.
Fourteen tail vertebrae and a set of chevron bones from a single animal, excavated at La Tejería in Teruel, place the giant as a close relative of Diplodocus hallorum. The find, published in the Journal of Vertebrate Paleontology, redraws the Late Jurassic map.
A computer analysis of sauropod thigh bones shows young Uberabatitan and Neuquensaurus could stand on their hind legs with surprisingly little strain.
By reading nickel isotopes trapped in the impact debris, researchers pinned the Chicxulub catastrophe on a primitive class of meteorite that rarely reaches Earth.
A duck-billed Edmontosaurus skull from Montana still carries the broken tooth of its attacker — rare, direct evidence of how the tyrant king hunted.
By reading growth rings in 17 tyrannosaur specimens, researchers nearly doubled the dinosaur's estimated growth timeline — and found that some famous 'T. rex' fossils may not be T. rex at all.
Sediment cores from 83-million-year-old deposits in China show precession-driven cycles drove abrupt wet-dry swings even in an ice-free greenhouse world — a cautionary analogue for our warming future.
Paleontologists in Teruel province have recovered the most complete Dacentrurus armatus skull ever found in Europe and proposed an entirely new evolutionary group, Neostegosauria, to make sense of where the plated dinosaur fits on the family tree.
Scientists find compelling evidence that Edmontosaurus fossil retains original collagen proteins, overturning long-held beliefs about fossilization.
Remarkably preserved Edmontosaurus fossil from South Dakota contains traces of original collagen proteins, challenging long-held beliefs about fossilization.
Powerful synchrotron X-rays uncover preserved blood vessels in 66-million-year-old Tyrannosaurus rex rib, providing new insights into dinosaur biology and recovery.
Crushed skull forgotten in drawer reveals new species that challenges understanding of early dinosaur evolution and mass extinction.
A UT Austin study using helium-3 to refine ancient sediment timelines reveals that biological recovery from the Chicxulub impact was orders of magnitude faster than previously estimated.