Tyrannosaurus rex is one of the most famous animals to have graced our planet, but according to a new study, it actually have been three different species, not one.
US scientists have re-analysed nearly 40 fossilised Tyrannosaurus skeletons found by paleontologists over the course of more than a century.
The specimens studied included ‘Sue’, a complete Tyrannosaurus skeleton currently at the Field Museum of Natural History in Chicago, and ‘AMNH 5027’, famously found at Big Dry Creek, Montana, in 1908.