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A study on the bone histology and growth patterns of Orthosuchus stormbergi is published by Weiss et al. (2024). [30] Woodward et al. (2024) note correlation between alligator femur volume and body mass, and use femur volume to determine body mass of goniopholidids, dyrosaurs, notosuchians and thalattosuchians. [31]
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 most complete specimen measures 12.3–12.4 m (40–41 ft) in length, but according to most modern estimates, Tyrannosaurus could have exceeded sizes of 13 m (43 ft) in length, 3.7–4 m (12–13 ft) in hip height, and 8.8 t (8.7 long tons; 9.7 short tons) in mass.
With a length of 12.1-12.2 meters, AMNH 5027 was discovered and excavated in 1908 by Barnum Brown in Montana, and described by Osborn in 1912 and 1916. At the time of discovery, a complete cervical (neck vertebrae) series for Tyrannosaurus was not previously known, so it was this specimen that brought the short, stocky tyrannosaur neck to light.
Perhaps the largest-known Tyrannosaurus, a specimen named Sue at the Field Museum in Chicago, is 40-1/2 feet (12.3 meters) long. This individual lived about 67 million years ago, near the ...
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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 years old. [8] The specimen known as Trix is also estimated to have been 30 years old upon its death. [14] However, its age was later revised to ~23–27 years old. [15]
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