In 1983, in southeastern New Mexico, near Kettle Top Butte, scientists found a partial skull. This skull belonged to a different kind of Tyrannosaurus called Tyrannosaurus mcraeensis. It is older than the famous T. rex, having a similar size but some differences, like a shallower and more curved lower jaw and lower hornlets above the eyes. Although only 25% of the skull is found, crucial parts like the braincase and upper jaws are still missing. This discovery challenges what we knew about Tyrannosaurus evolution and affects discussions about how they ate and chose mates. Despite arguments, it suggests that giant Tyrannosaurus species appeared much earlier, changing what we thought about their history in southern North America. Paleontologist Nick Longrich from the University of Bath points out the consistent differences in T. mcraeensis bones compared to T. rex bones, but some scientists think these differences are because of age and individual differences, making the discussion more complex. Additionally, there are disagreements about the fossil’s age, with some questioning the proposed 71–73 million-year timeline. This finding challenges our ideas, helping us understand more about dinosaur evolution in the prehistoric era.