'''Advanced.'''  These are not beginner lizards.  In my opinion, there is much to be learned about these animals.  It is exceedingly diffiicult to find consistent information on their taxonomy and captive care anywhere.  I have consulted numerous books, websites of reputable hobbyists, and drawn conclusions based on my own experiences keeping them.  The many "gray areas" in tegu care make them difficult to read and interpret.  Keepers should be aware that they are dealing with a potentially dangerous lizard with sharp teeth, powerful jaws, and heavy duty claws.  They are also intelligent animals that have no problem biting the hand that feeds.  I have been bitten several times by my smaller tegu and have observed them shredding screen tops, letting themselves out of their enclosures that were locked with cage clips, and rearranging things inside and outside their cages.  I have observed them around cats and small dogs and they do not seem to show any indication of fear.