Page 87 - The Dinosaur Book and Other Wonders of the Prehistoric World (DK-Smithsonian)

Bulky body had
plenty of space for
a large stomach to
process fibrous food.

Fossils of this big
dinosaur were found at
Muttaburra in Australia. Muttaburrasaurus

Many of these Iguanodontians
dinosaurs may have had
comblike dorsal crests.

Rhabdodon

Iguanodon

The long, heavy The skull
tail helped balance was narrow.
its large body.
The back legs were
longer and more
powerful than the
front legs, which
helped support
some of its weight.

Mantellisaurus Mantellisaurus had

a short thumb spike.

The back legs
were twice as long
as the front limbs.

Rhabdodon Iguanodon

many similar dinosaurs. They all had strong hind supported some of their weight with their
legs and shorter, weaker arms, and the smaller forelimbs. Despite this, their hands were adapted
ones such as Dryosaurus may have walked on for a variety of tasks, with hooflike middle
their hind legs. Many, including Tenontosaurus, fingers; a mobile grasping fifth finger; and a
Muttaburrasaurus, and the elephant-sized stout spike on the thumb that may have been
Iguanodon itself, were more heavily built and used as a defensive weapon. 85

US_084-085_Iguanodontians.indd 85 10/04/18 3:33 PM