It is often unappreciated the advanced nature of cold blooded creatures including of course lizards.
As mammals we consider mammals and warm blooded creatures as the pinnacle of evolutionary life forms.
Cold blooded creatures have many advantages and are better suited in many ecologies.
Not having to maintain a metabolism means that cold blooded creatures are much more economical in energy use.
The can live and prosper easily in climatic situations where warm blooded creatures can not.
As well like a crocodile during the dry season of no prey in Africa they can lie dormant for motnhs without food or water supply necessary .
We give mammals too much credit for being the highest form of life.

Benny Rempel
http://www.morgellonsresearchfoundation.com