Parasaurolophus lived in the late Cretaceous Period, around 75 million years ago, in what is now North America.

Fossils have been found in Alberta, Canada as well as Utah and New Mexico, USA.

The Parasaurolophus was first described by William Parks in 1922, two years after a partial skeleton and skull were found in Alberta.

Parasaurolophus were herbivores (plant eaters).

It could walk on either two legs or all four.

Researchers estimate that the Parasaurolophus was around 9.5 metres (31 feet) in length and weight around 2.7 tons.

Parasaurolophus comes from a family of dinosaurs known as Hadrosauridae that are known for having strangely shaped skulls.

The Parasaurolophus features a crest on its head that forms as a long, curved pipe pointing backwards from the skull.

There has been much debate about the functions of the crest but these days most scientists agree that it helped Parasaurolophus identify male and females, increased hearing ability (acoustic resonance) and also helped regulate body temperature (thermoregulation).