Have you heard of the iguana? I think I want one as a pet.
Iguanas are popular pets in some areas. I have seen them on leashes
I see, do you have one?
No, I don't. But there areplenty wild ones in the neighborhood because they are native to tropical areas in the Caribbean
How many different species of iguana are there?
Actually, there are just two. The green iguana is the popular pet. The other one in the Antilles is endangered because of habitat destructions.
Oh we should do something to save the Antilles from extinction! 
Yes, we should.  The word iguana comes from the Taino name for the species, "Iwana."
That makes sense. Are Iguanas aggressive or passive?
Actually, they are passive. They have a light sensing organ on top of the head which can see light but not details.  So they do not see very well.