Name: Tyrannosaurus ‭(‬Tyrant lizard‭) Phonetic: Ty-ran-no-sore-us Named By: Henry Fairfield Osborn‭ ‬-‭ ‬1905. Synonyms: Dinotyrannus megagracilis,‭ ‬Dynamosaurus imperiosus,‭ ‬Manospondylus gigas,‭ ‬Stygivenator molnari. Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Saurischia,‭ ‬Theropoda,‭ ‬Tyrannosauria,‭ ‬Tyrannosauridae. Species: T. rex (type) Type: Carnivore. Size: Most complete specimen 12.3 meters long, isolated remains suggest a potential upper size of around 13 meters long. Known locations: Western North America. Time period: Late Campanian/Early Maastrichtian of the Cretaceous. Fossil representation: Over‭ ‬30‭ ‬individuals are known,‭ ‬some forming almost complete skeletons.

Tyrannosaurus rex has been known to science since the end of the nineteenth century,‭ ‬and to this day remains arguably the most popular dinosaur the world over.‭ ‬This is evidenced by its almost mandatory inclusion in books,‭ ‬TV shows,‭ ‬games and websites that are about dinosaurs in general.‭ ‬Tyrannosaurus also probably has more toys and merchandising relating to it than any other dinosaur. There are a large number of fossils not just for Tyrannosaurus,‭ ‬but for the tyrannosaurid group as a whole,‭ ‬that represent individuals of different ages and their corresponding sizes.‭ ‬When these sizes and ages are put together,‭ ‬an S shaped growth curve is clearly displayed.‭ ‬This indicates that for roughly the first third of their lives,‭ ‬the tyrannosaurids grew quite slowly,‭ ‬reaching about a tenth of their full potential size.‭ ‬When they became teenagers however,‭ ‬they underwent a massive growth spurt,‭ ‬reaching nearly their full adult size in only about ten years.‭ ‬After this spurt,‭ ‬the rate of growth levels off as dramatically as it began when the individual reaches approximately twenty years of age.

While this is a common trait for the tyrannosaurid group,‭ ‬the rate of growth for Tyrannosaurus is even greater than the smaller tyrannosaurids like Gorgosaurus.‭ ‬This is even more spectacular when you consider that Tyrannosaurus is not thought to have lived any longer than its smaller brethren,‭ ‬but still grew meters longer,‭ ‬and several tons heavier.‭
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