A 125-million-year-old crocodile fossil has revealed preserved skin, possible sensory organs, sophisticated respiratory structures, and an unexpected pattern on its tail. Ultraviolet light exposed alternating bands that may represent ancient camouflage, potentially preserving the oldest known coloration in a crocodylomorph.
A feather discovered inside 66-million-year-old fossilized dinosaur poop may help explain why modern birds survived the asteroid catastrophe. The extinct bird it came from had more primitive insulating feathers, suggesting superior plumage may have helped the ancestors of living birds endure the deadly impact winter.
Scientists have identified a giant new dinosaur from Brazil that reached about 20 meters long and lived 120 million years ago. Its surprising evolutionary ties to a Spanish dinosaur suggest its ancestors crossed ancient land connections between Europe, Africa, and South America.
Turiasaurians were first recognized as a distinctive group of non-neosauropod eusauropods 20 years ago, and this development allowed for a number of problematic tooth-based eusauropod taxa from Laurasia to be assigned to Turiasauria, such
We describe a close relative of Spinosaurus aegyptiacus , the sail-backed, fish-eating giant from nearshore deposits of northern Africa. Spinosaurus mirabilis sp.
Background Tyrannosaurus rex , one of the most iconic non-avialan dinosaurs, remains a central focus of paleobiological research. Growth modeling suggests T. rex exceeded 8,000 kg within two decades and had a lifespan approaching 30 years.
The basal macronarian Camarasaurus is the most common sauropod genus from the Morrison Formation of western North America, with numerous specimens spanning the long vertical range in the Morrison.
The Late Cretaceous of western North America supported diverse dinosaur assemblages, though understanding patterns of dinosaur diversity, evolution, and extinction has been historically limited by unequal geographic and temporal sampling.
Large theropod dinosaurs are often reconstructed with their marginal dentition exposed because of the enormous size of their teeth and their phylogenetic association to crocodylians. We tested this hypothesis using a multiproxy approach.
Estimating dinosaur abundance Estimating the abundance of a species is a common practice for extant species and can reveal many aspects of its ecology, evolution, and threat level.
