Tyrannosaurids were once commonly thought to be descendants of earlier large theropods such as megalosaurs and carnosaurs, although more recently they were reclassified with the generally smaller coelurosaurs. Large fenestrae in the skull reduced weight, as in all carnivorous theropods. In other respects Tyrannosaurus’s skull was significantly different from those of large non-tyrannosaurid theropods. It was extremely wide at the rear but had a narrow snout, allowing unusually good binocular vision.
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My husband reply was to try and feed the money to his father saing he was staying for the first Christmas at home since 1973. So I thought to keep tensions down I would give him a real dinner, not his usual fair of two sandwiches at his work gate. Or midrats on a sub or hospital/rehab christmas dinner. I could not understand the reasons he was so angry about not getting sex from me and because of resistance to time off.
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Their initial research indicated that the skull bones were fused, and that it therefore represented an adult specimen. In light of this, Bakker and colleagues assigned the skull to a new genus named Nanotyrannus (meaning “dwarf tyrant”, for its apparently small adult size). The specimen is estimated to have been around 5.2 meters long when it died. However, In 1999, a detailed analysis by Thomas Carr revealed the specimen to be a juvenile, leading Carr and many other paleontologists to consider it a juvenile T. The D-shaped cross-section, reinforcing ridges and backwards curve reduced the risk that the teeth would snap when Tyrannosaurus bit and pulled. The remaining teeth were robust, like “lethal bananas” rather than daggers, more widely spaced and also had reinforcing ridges.
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They contend that what was really inside the tyrannosaur bone was slimy biofilm created by bacteria that coated the voids once occupied by blood vessels and cells. The researchers found that what previously had been identified as remnants of blood cells, because of the presence of iron, were actually framboids, microscopic mineral spheres bearing iron. They found similar spheres in a variety of other fossils from various periods, including an ammonite. In the ammonite, they found the spheres in a place where the iron they contain could not have had any relationship to the presence of blood. Schweitzer has strongly criticized Kaye’s claims and argues that there is no reported evidence that biofilms can produce branching, hollow tubes like those noted in her study. Other research challenges the identification of soft tissue as biofilm and confirms finding “branching, vessel-like structures” from within fossilized bone.
The results of this study potentially could shed light on how agility could have contributed to the success of tyrannosaurid evolution. Oxygen isotope ratios in fossilized bone are sometimes used to determine the temperature at which the bone was deposited, as the ratio between certain isotopes correlates with temperature. In one specimen, the isotope ratios in bones from different parts of the body indicated a temperature difference https://datingmentor.net/ of no more than 4 to 5 °C (7 to 9 °F) between the vertebrae of the torso and the tibia of the lower leg. This small temperature range between the body core and the extremities was claimed by paleontologist Reese Barrick and geochemist William Showers to indicate that T. Rex maintained a constant internal body temperature and that it enjoyed a metabolism somewhere between ectothermic reptiles and endothermic mammals.
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A study by Grant R. Hurlburt, Ryan C. Ridgely and Lawrence Witmer obtained estimates for Encephalization Quotients , based on reptiles and birds, as well as estimates for the ratio of cerebrum to brain mass. The study concluded that Tyrannosaurus had the relatively largest brain of all adult non-avian dinosaurs with the exception of certain small maniraptoriforms . The study found that Tyrannosaurus’s relative brain size was still within the range of modern reptiles, being at most 2 standard deviations above the mean of non-avian reptile EQs.
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Rex hypothesis has been criticized for not having been peer-reviewed, but rather was discussed in a television interview and book called Dino Gangs. Rex is based mainly by analogy to a different species, Tarbosaurus bataar. Bataar itself has not been peer-reviewed, and to Currie’s own admission, can only be interpreted with reference to evidence in other closely related species. According to Currie gregariousness in Albertosaurus sarcophagus is supported by the discovery of 26 individuals with varied ages in the Dry Island bonebed. He ruled out the possibility of a predator trap due to the similar preservation state of individuals and the near absence of herbivores. In the March 2005 issue of Science, Mary Higby Schweitzer of North Carolina State University and colleagues announced the recovery of soft tissue from the marrow cavity of a fossilized leg bone from a T.