I love Iguanas!  They have always been my favorite reptile.  First described in 1768 by an Austrian NIcolaus Laurenti.
What sets Iguanas apart from other reptiles like Lizard?
Well for one they can range in length, including their tails.  The name was derived from the Taino name "Iwana".
That's really interesting, I always thought it was a unique name. 
There are actually two types of Iguana as well.  The Green Iguana and the the lesser Antilles Iguana.
So, what's the difference?
The lesser Iguana is a little bit smaller.  Both possess a dewlap though, which is a row of spines running down their backs to their tails.
Awesome. It sounds like a little dinosaur.
It could be!  Dinosaurs were a diverse group of reptiles and we know that Iguanas are also reptiles!
I wonder if there are more types of Iguana though.