منابع مشابه
Biomechanics of dromaeosaurid dinosaur claws: application of X-ray microtomography, nanoindentation, and finite element analysis.
Dromaeosaurid theropod dinosaurs, such as Velociraptor, possess strongly recurved, hypertrophied and hyperextensible ungual claws on the pes (digit II) and manus. The morphology of these unguals has been linked to the capture and despatching of prey. However, the mechanical properties or, more importantly, the mechanical potential of these structures have not been explored. Generation of a 3D f...
متن کاملWear biomechanics in the slicing dentition of the giant horned dinosaur Triceratops
Herbivorous reptiles rarely evolve occluding dentitions that allow for the mastication (chewing) of plant matter. Conversely, most herbivorous mammals have occluding teeth with complex tissue architectures that self-wear to complex morphologies for orally processing plants. Dinosaurs stand out among reptiles in that several lineages acquired the capacity to masticate. In particular, the horned ...
متن کاملDinosaur lactation?
Lactation is a process associated with mammals, yet a number of birds feed their newly hatched young on secretions analogous to the milk of mammals. These secretions are produced from various sections (crop organ, oesophageal lining and proventriculus) of the upper digestive tract and possess similar levels of fat and protein, as well as added carotenoids, antibodies and, in the case of pigeons...
متن کاملThe dinosaur flap
You know a story must have some truly delicious ingredients in order for it to bubble along for well over a century. And this one has just about everything short of sex: dinosaurs and birds are the meat in the story; and the sauce is a scientific disagreement nearly bordering on a blood feud. Thomas Henry Huxley started it all shortly after 1861, when the feathered fossils of Archaeopteryx were...
متن کاملDinosaur Reproduction and Parenting
Non-avian dinosaur reproductive and parenting behaviors were mostly similar to those of extant archosaurs. Non-avian dinosaurs were probably sexually dimorphic and some may have engaged in hierarchical rituals. Non-avian coelurosaurs (e.g. Troodontidae, Oviraptorosauria) had two active oviducts, each of which produced single eggs on a daily or greater time scale. The eggs of non-coelurosaurian ...
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ژورنال
عنوان ژورنال: Proceedings of the Royal Society B: Biological Sciences
سال: 2006
ISSN: 0962-8452,1471-2954
DOI: 10.1098/rspb.2006.3532