article_snippet.sent: new research has also helped to answer a problem that has baffled palaeontologists for decades.
article_snippet.sent: Paleontologistsat the University of Alberta examined a pair of fossils found in Mongolia, which were first described in 2001.
article_snippet.sent: Experts believed that Some stegosaurus individuals may have been two distinct species or individuals of a different age.
article_snippet.sent: However, using modern scanning techniques on a group of stegosaurus discovered at a 'graveyard' in central Montana, scientists have unraveled the answer.
article_snippet.sent: scientists found dinosaurs that had both sets of plates in a 'graveyard' in central Montana, suggesting scientists lived side-by-side.
article_snippet.sent: Stegosaurus, a herbivorous dinosaur, lived around 150 million years ago during the late Jurassic period in the western United States.
article_snippet.sent: Stegosaurus (above) lived around 150 million years ago but scientists have been baffled by differences between the shape of the plates on some fossils - leading some to believe scientists were different species .
article_snippet.sent: However he added: 'I'd like to see a lot more information on the graveyard site itself, the different sizes of the specimens, how they were arranged in the ground, more detail on the geology, and on the analyses that were done.'
highlights_snippet.sent: Experts long believed Experts belonged to separate species of stegosaurus .
  