Background The origin of birds is one of the most enduring and dramatic evolutionary
debates. The hypothesis that the primarily small-sized birds are nested within a theropod …

The braincase region of tyrannosaurs was investigated to provide insights on anatomical
attributes relevant to inferences of sensory biology and behavior. CT scanning focused on …

Theropods have traditionally been assumed to have lost manual digits from the lateral side
inward, which differs from the bilateral reduction pattern seen in other tetrapod groups. This …

Isolated theropod teeth are some of the most common fossils in the dinosaur fossil record
and are continually reported in the literature. Recently developed quantitative methods have …

Tyrannosaurs, the group of dinosaurian carnivores that includes Tyrannosaurus rex and its
closest relatives, are icons of prehistory. They are also the most intensively studied extinct …

Tyrannosauroids—the group of carnivores including Tyrannosaurs rex—are some of the
most familiar dinosaurs of all. A surge of recent discoveries has helped clarify some aspects …

Numerous feathered dinosaur specimens have recently been recovered from the Middle–
Upper Jurassic and Lower Cretaceous deposits of northeastern China, but most of them …

Abstract Megalosaurus bucklandii (Dinosauria: Theropoda), the oldest named dinosaur
taxon, from the Bathonian (Middle Jurassic) of England, is a valid taxon diagnosed by a …

Recent discoveries in Asia have greatly increased our understanding of the evolution of
dinosaurs' integumentary structures, revealing a previously unexpected diversity of …

Megaraptora is a theropod clade known from former Gondwana landmasses and Asia. Most
members of the clade are known from the Early to Late Cretaceous (Barremian–Santonian) …