The thorny devil is the only lizard of its kind and Australia is the only place it can be found. They are between 6 and 8 inches long and can live from 12-20 years. Their weight is about the same as an average size mouse. They may be small creatures, but I wouldn't want to meet one.
Thorny devils change color depending on the temperature. You can see they are pretty spiky creatures. The spikes come in handy for protection from predators. Their diet is mostly ants, and they can eat several thousand in one day.
One of the most interesting things about these little devils is that they have a fake head on the back of their necks. When they are in danger they can just dip their real heads leaving the fake one to fool the enemy.