Our editor in chief Stanislav English TRAVEL TO MALAYSIA AND BORNEO Polska PLANETA KOMACH editor at large TROPIKALNE LASY. PRZESZLOŚĆ CZY PRZYSZLOŚĆ? English PLANET insects TROPYCHESKYE Forests: PROSHLOE Or Future?
Perhaps a couple of decades already tense heated debate between naukovtsiyamy - dinosaurs were warm-blooded or cold-blooded. Whereas in the past these creatures relegated to the reptiles, the wealth of factual material collected paleontologists of the twentieth century, showed that they were reptiles, and so on discussions started. Today, more and more biologists tend to believe that dinosaurs, like birds, are warm-blooded and not much different editor at large from the last. But until it disappeared proof of this assertion opponents last and scientific ferment.
About 7 years ago, paleontologists from the University of North Caroline Dane Russell and Mike Hammer studied the fossilized remains of a dinosaur found in 1993 in South Dakota, who was given the nickname Villa, after the wife of a farmer, editor at large whose Lord was excavated prehistoric creature. Villa belonged to a group of small herbivorous editor at large dinosaurs editor at large - teselozavriv that weighed 350 pounds and had chotyrohmetrovyy tail. Feature finds that for the first time in the history of science were found not only bones, but fossilized muscle tissue of animals that lived 66 million ago. These soft parts brought sensation in studying them using X-rays, it was found that the dinosaurs were actually warm-blooded animals. "The thing is - says Russell - Villas in clear-cut a four heart that pompuvalo blood in the small - the pulmonary circulation, and then throughout the body - a large circle, just as does the human heart. Most reptiles heart-chamber. But even in those who have it a four, for example, the crocodile, the blood passes through the artery twins in which there is mixing of oxygenated blood from where it was. The presence of one artery - a very important factor - says Dave Russell - it challenges many previous fundamental theories as to how and where monstrous reptiles evolved. "
In contrast to American scientists, Paleontological Institute of Russian editor at large Academy of Sciences Vladimir Alifanov offers a message of Americans viewed only as hypothesis: editor at large "The researchers could correctly interpret the results of X-ray fossils - that they believe the heart can be petrified piece of food, and a foreign body ". Regarding teplokrovnosti dinosaurs, such a hypothesis editor at large in paleontology has been around for over 15 years. In addition, the dinosaurs were highly developed animals, and even the most primitive of them were to modern crocodiles. Therefore, the presence of a four heart can not raise any doubts. Finally, in species with a long neck blood pressure had to be very high, so that the blood could safely flow to the brain, as it is in the modern giraffe, but this requires a big heart. Generally, the dinosaurs were warm-blooded, like mammals or birds. For example, we know that their limbs when walking, placed directly under the trunk. In addition, cold-blooded animals use only superficial (skin) cooling and multiton giants, if cool, had warmed from the inside if they did not have the internal thermoregulation, as in warm-blooded. To not mentioned whether dinosaurs were warm-blooded, they need to be considered more biologically advanced than scientists previously imagined. Opponents teplokrovnosti dinosaurs provides very interesting arguments. The first dinosaurs were Oviparity and egg size is limited, so the distinction between adults, take for example, Stegosaurus, and a baby was 100 times greater. Is that the animal can grow and develop at a pace that is so increase to adulthood? It is likely to grow to the size of a real giant had been born great. Second, warm-blooded animals need constant food intake to maintain a constant temperature, and such giants as warm-blooded, have surprised his appetite. For example, the T-Rex would need to eat a ton of meat a day, but when the T-Rex would be cool as komodskyy dragon, then he could do a lot less food. In short - the debate continues ...
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Other articles on this topic: April 26, 2009 - Triassic - the birth of Dinosaurs (14) January 26, 2009 - death of the dinosaurs: a hypothesis meteor shower (16) March 22, 2008 - history of the discovery of dinosaurs (2) March 16, 2008 - The tragedy of titanium (17) November 16, 2007 - Dinosaurs at high studs, OR walking Brachiosaurus (0)
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