Muttaburrasaurus ("Lizard from Muttaburra") was a member of the Iguanodon dinosaur family that lived in the Southern Hemisphere in Australia and Antarctica, (106-95) Million Years Ago during the Cretaceous Period. However, what makes Muttaburrasaurus special is that it lives in sub-polar rain forests on what will one day become Australian continent. Unlike most of the Iguanodonts who preferred living in open woodland, this animal lived in the Antarctic/Australian jungle, where its coloration would've blend in, as shown in the series.
During the Middle Cretaceous period in Antarctica, Muttaburrasaurus was known as the largest of all the summer migrants. It was a 9 metered long, 3 ton herbivorous dinosaur. It made trumpeting calls as a means of herd communication. It is thought that it was a migratory animals, moving North and South with the changing seasons. It was the largest summer migrant, by a considerable margin.
Like other herbivores, Muttaburrasaurus lived in huge herds. Every year, herds of Muttaburrasaurus migrated 800 kilometers down the coast of Australia to find secure sights to lay their eggs in Antarctica. With each massive adult weighing about three tons, they could pluck food from branches several meters off the ground. While feeding, the dinosaurs kept in touch using the specially adapted noses to produce a range of trumpeting calls, similar to an Elephant. These herbivores were slow, but they found safety in size and numbers. Occasionally, these giant migrants got lost in the forest.