[223] The region is thought to have been dominated by semi-arid inland plains, following the probable retreat of the Western Interior Seaway as global sea levels fell. The small ceratopsian Leptoceratops also lived in the area. These species are characterized by high infant mortality rates, followed by relatively low mortality among juveniles. Hilarity ensues as the rather dense Tyrannosauruses attempt to cross. Get the bigger size to fully appreciate the fabulous artwork. [163] A 2017 study by Thomas Carr and colleagues found that the snout of tyrannosaurids was highly sensitive, based on a high number of small openings in the facial bones of the related Daspletosaurus that contained sensory neurons. instead his tyrannosaurus rex family came over via a fallen tree to eat them. The division into multiple species was primarily based on the observation of a very high degree of variation in the proportions and robusticity of the femur (and other skeletal elements) across catalogued T. rex specimens, more so than that observed in other theropods recognized as one species. [163] A study published by Kent Stevens concluded that Tyrannosaurus had keen vision. Tyrannosaurus Drip by Julia Donaldson - AbeBooks [67], In a 2022 study, Gregory S. Paul and colleagues argued that Tyrannosaurus rex, as traditionally understood, actually represents three species: the type species Tyrannosaurus rex, and two new species: T. imperator (meaning "tyrant lizard emperor") and T. regina (meaning "tyrant lizard queen"). [204], Tyrannosaurus may have had infectious saliva used to kill its prey, as proposed by William Abler in 1992. Watching everyone join in with Sam on the repeating parts was pretty cute! my 6 year old looked at the book and back at me and said but there were kids on there definitely the first and hopefully the last of her books to disappoint us all because we love her work! [171], Currie's pack-hunting T. rex hypothesis has been criticized for not having been peer-reviewed, but rather was discussed in a television interview and book called Dino Gangs. The generic name is derived from the Greek words (tyrannos, meaning "tyrant") and (sauros, meaning "lizard"). [21], Two isolated fossilized footprints have been tentatively assigned to T. rex. The sensitive neurovascular canals of Tyrannosaurus also likely were adapted to performing fine movements and behaviors such as nest building, parental care, and other social behavior such as intraspecific communication. The presence of avulsion injuries being limited to the forelimb and shoulder in both Tyrannosaurus and Allosaurus suggests that theropods may have had a musculature more complex than and functionally different from those of birds.
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