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Predatory Dinosaurs from the Sahara and Late Cretaceous Faunal Differentiation
Late Cretaceous (Cenomanian) fossils discovered in the Kem Kem region of Morocco include large predatory dinosaurs that inhabited Africa as it drifted into geographic isolation. One, represented by aExpand
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Evidence for Avian Intrathoracic Air Sacs in a New Predatory Dinosaur from Argentina
Background Living birds possess a unique heterogeneous pulmonary system composed of a rigid, dorsally-anchored lung and several compliant air sacs that operate as bellows, driving inspired airExpand
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An integrative approach to understanding bird origins
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 dinosaur group thatExpand
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Nest and egg clutches of the dinosaur Troodon formosus and the evolution of avian reproductive traits
Living archosaurs (crocodilians and birds) share several reproductive features, including hard-shelled eggs1, parental care2,3, assembly-line oviducts4 and luteal morphology5. Nevertheless,Expand
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First trace and body fossil evidence of a burrowing, denning dinosaur
A fossil discovery in the mid-Cretaceous Blackleaf Formation of southwest Montana, USA, has yielded the first trace and body fossil evidence of burrowing behaviour in a dinosaur. Skeletal remains ofExpand
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EMBRYOS AND EGGS FOR THE CRETACEOUS THEROPOD DINOSAUR TROODON FORMOSUS
Abstract Elongate and asymmetric eggs of the oospecies Prismatoolithus levis occur regularly in the Upper Cretaceous Two Medicine Formation of western Montana. These eggs had previously been assignedExpand
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A New Troodontid Theropod, Talos sampsoni gen. et sp. nov., from the Upper Cretaceous Western Interior Basin of North America
Background Troodontids are a predominantly small-bodied group of feathered theropod dinosaurs notable for their close evolutionary relationship with Avialae. Despite a diverse Asian representationExpand
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A Second Soundly Sleeping Dragon: New Anatomical Details of the Chinese Troodontid Mei long with Implications for Phylogeny and Taphonomy
A second nearly complete, articulated specimen of the basal troodontid Mei long (DNHM D2154) is reported from the Early Cretaceous (Hauterivian-Valanginian) lower Yixian Formation, Liaoning Province,Expand
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Anatomy of the Early Cretaceous Bird Rapaxavis Pani, A New Species From Liaoning Province, China
ABSTRACT The lacustrine deposits of the Jiufotang Formation, Liaoning Province, China have yielded a diverse avifauna representing a wide spectrum of basal lineages. Here we add to this diversityExpand
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Marine transgressions and the evolution of Cretaceous dinosaurs
FLUCTUATIONS (transgressions and regressions) of intercon-tinental sea-ways during the Mesozoic Era affected the habitat area of coastal plains by alternately restricting the space duringExpand
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