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Montana's T. rex (also known as "Peck's rex", "Peckrex", "Rigby's rex" and Tyrannosaurus "imperator") is the nickname given to a fossil specimen found in Montana in 1997. [54] The discovery was made by Louis E. Tremblay on 4 July 1997 working under the supervision of J. Keith Rigby Jr. who led the excavation and bone preparation.
Bucky the T. rex: Casper Statens Naturhistoriske Museum [176] [177] Tyrannosaurus rex: Casper the T. rex: Chinley [178] [179] [180] Tyrannosaurus: Previously known as the Mud Butte Tyrannosaur Chomper MOR 6625 Museum of the Rockies: Tyrannosaurus: Juvenile skull, named for initial find of small lower jaw fragment. Cast of Chomper in Berkeley ...
Profile view of a skull (AMNH 5027) The largest known T. rex skulls measure up to 1.54 m (5.1 ft) in length. [20] [31] Large fenestrae (openings) in the skull reduced weight, as in all carnivorous theropods. In other respects Tyrannosaurus's skull was significantly different from those of large non-tyrannosaurid theropods.
The Black Hills Institute of Geological research, Hendrickson's employer, paid the land's owner $500 for the right to excavate the skeleton. Eventually, in May 2000, Sue's skeleton went on display ...
Victoria is estimated at the age of around 18–25 at the time of her death 65 million years ago. Her skeleton includes approximately 199 bones and nearly complete skull, accounting for about 65% of the total skeleton, making her the second most complete T. rex skeleton discovered to date (behind “Sue” for completeness).
Skull and neck of Daspletosaurus, from the Field Museum of Natural History in Chicago. Skulls of early tyrannosauroids were long, low and lightly constructed, similar to other coelurosaurs, while later forms had taller and more massive skulls. Despite the differences in form, certain skull features are found in all known tyrannosauroids.
This sudden change in growth rate may indicate physical maturity, a hypothesis that is supported by the discovery of medullary tissue in the femur of an 18-year-old T. rex from Montana (MOR 1125, also known as "B-rex"). [51] Medullary tissue is found only in female birds during ovulation, indicating that "B-rex" was of reproductive age. [52]
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