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The fastest growth rate is estimated to occur around 12–16 years of age, reaching 122 kg (269 lb) per year, based on a 1,300 kg (2,900 lb) adult, which is about a fifth of the rate for T.-rex. For Gorgosaurus , the calculated maximum growth rate is about 110 kilograms (240 lb) during the rapid growth phase, which is comparable to that of ...
The sudden change in growth rate at the end of the growth spurt may indicate physical maturity, a hypothesis which is supported by the discovery of medullary tissue in the femur of a 16 to 20-year-old T. rex from Montana (MOR 1125, also known as B-rex).
A graph showing the hypothesized growth curves (body mass versus age) of four tyrannosaurids. Tyrannosaurus rex is drawn in black. Based on Erickson et al. 2004. Tyrannosaurus rex showed a "teenage growth spurt": [56] [57] ½ ton at age 10; very rapid growth to around 2 tons in the mid-teens (about ½ ton per year). negligible growth after the ...
Having juvenile specimens helps reveal the Tyrannosaurus growth rate and body changes during maturation, Lyson said. Only a handful of such fossils are available for study. It appears this one is ...
One of the traits that helped make the dinosaurs such an evolutionary success story - thriving for 165 million years - was their fast growth rate, from massive meat-eaters like Tyrannosaurus to ...
The growth line annuli are found compressed between broad vascularized regions of bone with randomly oriented fibrillar patterns, known as zones. Lines of arrested growth, similar to annuli, are found between zones are avascular. They are, however, much thinner, and have relatively fewer bone fibers by volume.
His findings, published in 2019, yielded that Scotty is the largest (in weight and length), having out-measured the previous largest known Tyrannosaurus rex: Sue of the Chicago Field Museum (FMNH 2081). [13] After prolonged study of the growth patterns in the bones, "Scotty" was also declared as one of the oldest known T. rex fossils at 30 ...
Other studies have suggested higher adult weights, which would affect the magnitude of the growth rate, but not the overall pattern. Tyrannosaurids similar in size to Albertosaurus had similar growth rates, although the much larger Tyrannosaurus rex grew at almost five times this rate (601 kilograms [1,325 pounds] per year) at its peak. [6]