Saturday, June 30, 2012

Nest occupied of child dinosaurs found


child dinosaurs

The fossilized remains of a fossil brooding in its nest have emerged from the red sandstones of the gobi wasteland in mongolia, providing new evidence for a far longer-lived and flexible species than previously thought.
Called mpc-d 107/15, the new specimen is an oviraptor, which is the only dinosaur ever found in the act of threatening. More specifically, it belongs to the class known as nemegtomaia barsboldi, a crested ostrich-like theropod that lived in late cretaceous mongolia.
A 70-million-year-old nest of the dinosaur protoceratops andrewsi has been found with proof that 15 juveniles were once indoors it, according to a paper in the latestjournal of paleontology.
While huge numbers of eggs have been connected with other dinosaurs, such as the meat-eating oviraptor or sure duck-billed hadrosaurs, judgment multiple juveniles in the same dino nest is fairly rare.

Thursday, June 28, 2012

Dinosaurs may have been hot blooded: study


Dinosaur

Researchers in Spain and Norway reported in the periodical Nature they had found tree-like growth rings on the bones of mammals, a characteristic that until now was thought to be limited to cold-blooded creatures and dinosaurs.
They also found proof that dinosaurs probably had a high metabolic rate to allow fast growth another pointer of warm-bloodedness.
"Our results strongly propose that dinosaurs were hot-blooded," lead author Meike Koehler of Spain's Institut Catala de Paleontologia told AFP.
If so, the findings should punctual a rethink about reptiles, she said.
Modern-day reptiles are cold-blooded, meaning they cannot control their body temperatures through their own metabolic system relying instead on outside means such as basking in the sun.
While the dinosaurs may have been hot-blooded, their other characteristics kept them directly in the reptile camp, said Koehler.
Paleontologists have long noted the ring-like markings on the bones of cold-blooded creatures and dinosaurs, and taken them to designate pauses in growth, perhaps due to cold periods or lack of food.
The bones of hot-blooded animals such as birds and mammals had never been correctly assessed to see if they, too, display the lines.
Koehler and her team found the rings in all 41 hot-blooded animal species they studied, counting antelopes, deer and giraffes.
The finding "eliminates the strongest quarrel that does survive for cold-bloodedness" in dinosaurs, she said.
The team's analysis of fillet tissue also showed that the fast enlargement rate of mammals is related to a high metabolism, which in turn is characteristic of hot-bloodedness.
"If you compare this hankie with dinosaur tissue you will see that they are equal," said Koehler.
"So this means that dinosaurs not only grew very fast but this increase was sustained by a very high metabolic rate, representative hot-bloodedness."
A comment by University of California palaeontologist Kevin Padian that was available with the paper said the study was the latest to chip away at the long-held theory that dinosaurs were cold-blooded.
"It seems that these were anything but characteristic reptiles, and Koehler and colleagues' findings remove another false association from this picture."

Tuesday, June 26, 2012

Dinosaurs Lighter Than formerly Reflection


Dinosaurs

University of Manchester biologists used lasers to measure the minimum amount of skin requisite to enfold around the skeletons of modern-day mammals, including reindeer, polar bears, giraffes and elephants.
They exposed that the animals had almost exactly 21% more body mass than the minimum emaciated 'skin and bone' wrap volume, and applied this to a giant Brachiosaur skeleton in Berlin's Museum für Naturkunde.
Previous estimates of this Brachiosaur's weight have varied, with estimates as high as 80 tonnes, but the Manchester team's calculations published in the magazine Biology Letters abridged that figure to just 23 tonnes. The team says the new method will apply to all dinosaur weight capacity.
Direct author Dr Bill Sellers said: "One of the most important things palaeobiologists require to know about fossilized animals is how much they weighed. This is astonishingly difficult, so we have been testing a new approach. We laser scanned various large creature skeletons, including polar bear, giraffe and elephant, and calculated the minimum packaging volume of the main skeletal sections.
"We showed that the actual volume is reliably 21% more than this value, so we then laser scanned the Berlin Brachiosaur, Giraffatitan brancai, calculating the skin and bone packaging volume and added 21%. We found that the giant herbivore weighed 23 tonnes, sustaining the view that these animals were much lighter than usually thought.
Dr Sellers, based in Manchester's Faculty of Life Sciences, explained that body mass was a critical limit used to constrain biomechanical and physiological traits of organisms.
He said: "Volumetric methods are becoming more common as techniques for estimating the body masses of fossil vertebrates but they are often accused of extreme subjective input when estimating the width of missing soft tissue.
"Here, we display an alternative loom where a minimum convex hull is derived exactly from the point cloud generated by laser-scanning mounted skeletons. This has the benefit of requiring minimal user interference and is therefore more objective and far quicker.
"We tested this method on 14 large-bodied mammalian skeletons and established that it consistently underestimate body mass by 21%. We suggest that this is a robust method of estimating body mass where a mounted skeletal reconstruction is available and show its usage to predict the body mass of one of the main, comparatively complete sauropod dinosaurs, Giraffatitan brancai, as 23,200 kg.
"The value we got for Giraffatitan is at the low range of preceding estimates; although it is still huge, some of the huge estimates of the past 80 tonnes in 1962 are overstated. Our method provides a much more accurate gauge and shows dinosaurs, while still huge, is not as big as earlier thought."

Friday, June 22, 2012

Baby dinosaurs are looking like modern birds


Baby Dinosaur

Modern birds preserve the physical characteristics of baby dinosaurs, according to a new nature study that found birds are even more intimately related to dinos than previously thought.
Depending on the non-avian dinosaur and bird compared, that might be durable to believe. A toothy, angry rebuilding of tyrannosaurus rex, for example, on first glimpse looks little like a common backyard blue jay.
When researchers go beyond the outside to the tissue and skull levels, however, the similarities become more palpable.
News: 'extinct' animals back from the edge
Harvard University’s arkhat abzhanov, correlate professor of organismic and evolutionary biology, and bhart-anjan bhullar, a ph.d. Student in abzhanov laboratory and the first author of the study did just that and found proof that the evolution of birds is the result of a radical change in how dinosaurs urbanized. Rather than take years to reach sexual adulthood, as many dinosaurs did, birds sped up the clock (some species take as little as 12 weeks to mature), allowing them to lock into their baby relic look  
"What is interesting about this investigate is the way it illustrates evolution as a developmental occurrence," abzhanov was quoted as saying in a press release. "By changing the developmental ecology in early species, nature has shaped the modern bird a completely new creature and one that, with approximately 10,000 species, is today the most winning group of land vertebrates on the planet."