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A size comparison of various specimens of the theropod dinosaur genus Allosaurus. • Silhouettes are based on Allosaurus skeletal reconstructions by Scott Hartman and Henrique Paes , used with permission. I, the author, require that Scott Hartman, Henrique Paes and steveoc 86 at Wikimedia Commons get attribution.
The individual itself was below the average size for Allosaurus fragilis, [36] as it was a subadult estimated at only 87% grown. [38] The specimen was described by Breithaupt in 1996. [ 34 ] Nineteen of its bones were broken or showed signs of serious infection, which may have contributed to "Big Al's" death.
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The specimen's considerable size places it within the range of known T. rex individuals, suggesting the presence of large tyrannosaurids during the Campanian stage (~75 million years ago), a temporal range earlier than the established Maastrichtian age (~68–66 Ma) for Tyrannosaurus rex. However, the exact age and provenance of CM 9401 remain ...
T. rex juveniles remained under 1,800 kg (4,000 lb) until approximately 14 years of age, when body size began to increase dramatically. During this rapid growth phase, a young T. rex would gain an average of 600 kg (1,300 lb) a year for the next four years.
Torvosaurus (/ ˌ t ɔːr v oʊ ˈ s ɔːr ə s /) is a genus of large megalosaurine theropod dinosaur that lived approximately 165 to 148 million years ago during the Callovian to Tithonian ages of the late Middle and Late Jurassic period in what is now Colorado, Portugal, Germany, and possibly England, Spain, Tanzania, and Uruguay.
The dinosaur's bones were discovered in a mine in Wales in the 1950s. A more recent analysis found that the ignored fossils are a distinct species.
Dinosaurs show some of the most extreme variations in size of any land animal group, ranging from tiny hummingbirds, which can weigh as little as two grams, to the extinct titanosaurs, such as Argentinosaurus and Bruhathkayosaurus [1] which could weigh as much as 50–130 t (55–143 short tons).