The Dinosaur is a giant, remote-controlled robot with a head resembling that of a Teensie's, along with two raptor-like legs. It tends to hop a lot like a kangaroo.
Role in the Games
The Dinosaur doesn't appear until the grand finale of the Iron Mountains. It is dangerous for Rayman to approach, but otherwise helpful: its jumping makes a crate bounce just high enough for Rayman to enter the Reformatory. Similarly, a crate bounces inside the Reformatory; this allows Rayman to reach the Reformatory's roof.
However, once Rayman reaches the roof the Dinosaur's role is another story completely. After Rayman releases Globox's children from the Reformatory, the Dinosaur is quick to react. Rayman must speedily zip by the incoming Dinosaur or risk being flattened.
The exception to the rule is the PS version of Rayman 2, in which Razorbeard's lackey accidentally breaks the remote control, rendering the Dinosaur useless.