October 22, 2011 by zssedu
A group of scientists from Cambridge, London and Melbourne has recently found the remains of a huge tyrannosaurus. It is the first piece of evidence in history that dinosaurs inhabited the southern continents of the Earth. The discovery was made in a place called Dinosaur Cove near Victoria in Australia. The scientists unearthed a well-preserved thighbone of a small reptile which was qualified as one of the ancestors of Tyrannosaurus Rex.
This discovery has shed new light on th history of evolution of this group of dinosaurs. Thanks to it a really important question arose: Why was it only in the northern hemisphere that tyrannosauruses grew as giant as Tyrannosaurus Rex?
The unearthed bone came from an animal that measured approximately three meters in length and weighed about eighty kilograms. The reptile had a large head and tiny paws, which is the most characteristic feature of tyrannosaurus.
The last identified dinosaur was called NMV P186069 and was actually smaller than Rex, which was above twelve meters long and weighed above four tonnes. The mammoth reptile could grow to this massive size only in the last stage of development of this species.
According to dr. Roger Benson from the faculty of Geological Sciences on the University of Cambridge “it is extraordinarily tough to explain, why different groups of animals could survive more easily in the north and the other in the south. Now we have to know what the tyrannosaurus’s hike between continents looked like, why these reptiles died out and of course how they managed in the southern hemisphere. The answers to the above questions can only be found with next discoveries”.