The 1990s have confirmed that several species of dinosaurs possessed feathers, birds rooting in the taxon of the dinosaurs and making them, according to most paleontologists, the last living dinosaurs. The detailed study of the bones of archeopteryx has yet to show that this ancestor was closer than thought dinosaurs which it descends. Since the late 1990s it is legitimate to include a menu on the flat "Dinosaur-fries" instead of "Chicken-fried. Indeed, the discovery in China of fossils of small dinosaurs showed what some have suspected since the late nineteenth century, dinosaurs have not all disappeared in the late Cretaceous and birds were the last part of the existing group of 'mythical animals. Discovered shortly after the

publication of the theory of Darwinian evolution in layers of limestone lithography in the region around the town of Solnhofen in Bavaria, the remains of a archeopteryx were quickly interpreted by Thomas Huxley as a transitional form between the reptiles and birds. The 10 currently known specimens all show a mixture of characteristics of reptiles and other dinosaurs of the approaching birds, in full agreement with this thesis. However, Huxley's ideas were violently fought at the time and it took the work of John Ostrom, and especially the paleontologists take more seriously the possibility that dinosaurs may have been animals with blood hot for that dinosaur-bird lineage is not mentioned again that researchers can look up to heaven.One reason for the hostility of paleontologists that was just flapping requiring metabolism high energy, the appearance of birds should be possible in a group of warm-blooded animals. What was not compatible with the prevailing image of dinosaurs, of cold-blooded animals and few assets. The discovery in China of "dinoiseaux (dino-birds in English) from the years 1995 would demolish the arguments of opponents to the theory of Huxley and now fossil animals as Caudipteryx are well known. Still, the problem of metabolism of animals as archeopteryx remained. How to solve this problem in the absence of living specimens? It turns out that as an animal metabolism, growth and structure of his bones are not the same. Therefore, the paleontologist Gregory M. Erickson and his colleagues decided to examine the bones archeopteryx a little closer. The study results were surprising and have recently been published recently in the renowned journal PlosOne.In the case of a warm-blooded animal, bones are highly vascularized and show other characteristics of rapid growth. In the case of a cold-blooded animal is observed rather weak vascular and bone density. Precisely a structure similar to this last case was discovered by researchers. Comparing the characteristics of the fossil bones of juveniles of archeopteryx with those of known dinosaur relatives, like the famous Velociraptor from Jurrasic Park, and those early birds as prima Jeholornis and Sapeornis chaochengensi, paleontologists found again the same results. They were then able to deduce the growth rate of juvenile archeopteryx from the length of his femur. These animals reached adult size, that of a crow, in 970 days. It is three times slower than a modern bird, but four times faster than a snake and this period is comparable to what we imagine for the dinosaurs. The findings of the study are numerous. First Archeopteryx was closer to primitive dinosaurs than previously thought. Then it probably was not necessary to have a bird's metabolism for a flight beaten a dinosaur that was enough. Finally, the transition to a bird's metabolism has been done millions of years after which time the archeopteryx lived there about 150 million years.