Lizards are interesting animals.  There are over 6000 species that live on all continents.  What an amazing animal. 
Oh really. I never know we have so much diversified species. 
Yes, there are quite a few different ones.  They range in size from just a few centimeters to a few meters long.  They can get large!
What is the maximum size for a lizard
I'm not sure about the actual length but it has to be the Komodo dragon.  They get really large.  They are territorial and often fight for their area. 
I see. I have seen them fight before. DO you know about agama lizard
I've never seen one in person but I know that they are found in Africa.  I wish that I could travel there sometime. 
Oh yeah and in Asia too. They have some kind of colorful head
Is it a carnivore type of lizard or more of a herbivore?
I have not seen it eaten before. But i read about it. Maybe carnivore. But i am not sure.