منابع مشابه
Dinosaur 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 ...
متن کاملDinosaur Extinction : Changing Views
I David Archibald is Professor of Biology and Curator of Mammals at San Diego State University. He received his Ph.D. from the University of California, Berkeley in 1977. He has written numerous articles, essays, reviews, and monographs on the systematics and evolution of early mammals, biostratigraphy, faunal analysis, and extinction. His fieldwork has taken him from the American West to Middl...
متن کاملProposal on Dinosaur Extinction
The extinction of the dinosaurs is an import issue that can shed light on the repeated occurrences of mass extinctions. It is very important that we don’t blindly accept theories because they are lavish and extravagant. Our aim is to show that dinosaurs didn’t die out due one catastrophic celestial event. On the contrary we intend to prove that their extinction was a much more complex process t...
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ژورنال
عنوان ژورنال: Journal of Experimental Biology
سال: 2013
ISSN: 1477-9145,0022-0949
DOI: 10.1242/jeb.065383