After analysing the teeth and thigh bones of 38 T. rex fossils, some researchers propose reclassifying them as three different species, but others are unconvinced
. But the proposal is already proving unpopular with other palaeontologists.was an apex predator that lived in North America between about 68 and 66 million years ago. The firstfossils were discovered more than a century ago, but for decades very few skeletons were known. More have come to light since the 1990s, says
at the College of Charleston, South Carolina, which means it is now possible to assess whether or not the animals fall into a single species. To explore this question, Persons and his colleague Jay Van Raalte worked with independent researcherfossils, focusing in particular on two features: the number of front teeth in the lower jaw and the stoutness of the thigh bones.is going hybrid, with a live in-person event in Manchester, UK, that you can also enjoy from the comfort of your own home,They discovered variation in both features, which they think justifies splitting the dinosaurs into three distinct species.
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