A new analysis of Tyrannosaurus rex teeth indicates the ancient predator maintained a body temperature of about 36.3 degrees Celsius (97.3 degrees Fahrenheit),...
Paleontologists in Montana have discovered remarkably preserved feathers of an ancient aquatic bird inside a fossilized dinosaur dropping, offering rare...
Paleontologists in North Dakota have unearthed a set of 66.5-million-year-old fossilized footprints that can be confidently attributed to a full-grown...
Thousands of fossilized bones from a Cretaceous-period bonebed in Wyoming, the United States, offer rare physical evidence that Tyrannosaurus rex fed on...
Paleontologists from University College London and the University of Cambridge say the large predatory dinosaurs’ tiny arms evolved alongside massive...
A large tyrannosaurid dinosaur may have stalked the floodplains of what is now New Mexico nearly 74 million years ago, according to a team of paleontologists...
A semi-complete skull of an adult Edmontosaurus at Montana State’s Museum of the Rockies preserves a fleeting moment from the Late Cretaceous: a tyrannosaur...
A comprehensive analysis of 17 fossil specimens reveals that Tyrannosaurus rex grew far more slowly than previously thought — reaching its full-grown...
Nanotyrannus lancensis — long thought by many to be a teenage Tyrannosaurus rex — was in fact a fully mature, distinct species of smaller tyrannosaurid,...
Paleontologists have examined an exceptionally well-preserved, near somatically mature tyrannosaur skeleton from the Hell Creek Formation of Montana. Their...
Using a technique called Resonance Raman spectroscopy, paleontologists have detected hemoglobin remnants in bone extracts from two dinosaur species, Brachylophosaurus...
The atmosphere of Earth during the Mesozoic era, between 252 and 66 million years ago, contained far more carbon dioxide than it does today and total photosynthesis...
Scientifically named Khankhuuluu mongoliensis, the newly-identified tyrannosauroid species is the closest-known ancestor to Tyrannosaurus rex.
Khankhuuluu...
The genus Tyrannosaurus most likely arose in North America, although its direct ancestors migrated over from Asia more than 70 million years ago, according...
Large theropods were as smart as reptiles but not as intelligent as monkeys, according to new research led by University of Bristol paleontologists.
Tyrannosaurus...
The discovery of Tyrannosaurus mcraeensis, a sister species of the famous Tyrannosaurus rex, suggests that tyrannosaurid dinosaurs originated on Laramidia,...
Tyrannosaurs are among the most intensively studied and best-known dinosaurs. Despite this, their relationships and systematics are highly controversial....
Non-avian theropod dinosaurs such as the iconic Tyrannosaurus rex have long been portrayed with their teeth fully visible, similar to living crocodiles....
Daspletosaurus wilsoni, a tyrannosaurid dinosaur that lived 76.5 million years ago in what is now Montana, the United States, displays a unique combination...
