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Its taxonomy is also controversial, as some scientists consider Tarbosaurus bataar from Asia to be a second Tyrannosaurus species while others maintain Tarbosaurus is a separate genus.Several other genera of North American tyrannosaurids have also been synonymized with Tyrannosaurus.Because all known skin impressions from larger tyrannosauroids known at the time showed evidence of scales, the researchers who studied Dilong speculated that feathers may correlate negatively with body size—that juveniles may have been feathered, then shed the feathers and expressed only scales as the animal became larger and no longer needed insulation to stay warm.
The abundance of fossil material has allowed significant research into many aspects of its biology, including its life history and biomechanics.
The feeding habits, physiology and potential speed of Tyrannosaurus rex are a few subjects of debate.
To compensate for the immense bulk of the animal, many bones throughout the skeleton were hollow, reducing its weight without significant loss of strength.
Large fenestrae (openings) in the skull reduced weight and provided areas for muscle attachment, as in all carnivorous theropods.
Tyrannosaurus had a much wider range than other tyrannosaurids.
Fossils are found in a variety of rock formations dating to the Maastrichtian age of the upper Cretaceous Period, 68 to 66 million years ago.
The species Tyrannosaurus rex (rex meaning "king" in Latin) is one of the most well-represented of the large theropods.
Tyrannosaurus lived throughout what is now western North America, on what was then an island continent known as Laramidia.
By far the largest carnivore in its environment, Tyrannosaurus rex was most likely an apex predator, preying upon hadrosaurs, armoured herbivores like ceratopsians and ankylosaurs, and possibly sauropods.