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  • extinct
  • These debates sparked interest in new methods for ascertaining the palaeobiology of extinct animals, such as bone histology, which have been successfully applied to determining the growth-rates of many dinosaurs. (wikipedia.org)
  • reptiles
  • Despite these considerations, the image of dinosaurs as large reptiles had already taken root, and most aspects of their paleobiology were interpreted as being typically reptilian for the first half of the twentieth century. (wikipedia.org)
  • Today, it is generally thought that many or perhaps all dinosaurs had higher metabolic rates than living reptiles, but also that the situation is more complex and varied than Bakker originally proposed. (wikipedia.org)
  • genera
  • Archosaur genera that also narrowly miss out on being classified as dinosaurs include Schleromochlus 220-225 Ma, Lagerpeton 230-232 Ma and Marasuchus 230-232 Ma. (wikipedia.org)
  • These species are placed in about 300 valid dinosaur genera ( Stegosaurus , Diplodocus , etc.), although about 540 have been named. (usgs.gov)
  • Recent estimates suggest that about 700 to 900 more dinosaur genera may remain to be discovered. (usgs.gov)
  • Most dinosaur genera presently contain only one species (for example, Deinonychus ) but some have more (for example, Iguanodon ). (usgs.gov)
  • scientists
  • However, with the discovery of much more complete skeletons in western United States, starting in the 1870s, scientists could make more informed interpretations of dinosaur biology and physiology. (wikipedia.org)
  • In March 2017, scientists reported a new way of classifying the dinosaur family tree, based on newer and more evidence than available earlier. (wikipedia.org)
  • lizards
  • During the early years of dinosaur paleontology, it was widely considered that they were sluggish, cumbersome, and sprawling cold-blooded lizards. (wikipedia.org)
  • Despite
  • Despite these reptilian appearances, Owen speculated that dinosaur heart and respiratory systems were more similar to that of a mammal than a reptile. (wikipedia.org)
  • evidence
  • Recently, many new lines of evidence have been brought to bear on dinosaur physiology generally, including not only metabolic systems and thermoregulation, but on respiratory and cardiovascular systems as well. (wikipedia.org)
  • In most of his writings Bakker framed his arguments as new evidence leading to a revival of ideas popular in the late 19th century, frequently referring to an ongoing dinosaur renaissance. (wikipedia.org)
  • large
  • According to the new classification, the original dinosaurs, arising 200 million years ago, were small, two-footed omnivorous animals with large grasping hands. (wikipedia.org)