At first I thought you meant a cyclura of some sorts but then I saw the picture of the green iguana wich I knew grew quite Teritorial as adults.A cautionary tale for you - I got my iguana as a tiny little monster back in 2004. He was about 6 inches long SVL and he was my baby. I loved him and spoiled him and he was literally my best buddy. He came to work with me at the vet clinic, he rode around in my car and he even tolerated petting from small noisy children. He was amazingly docile.
As a juvenile he was in a big 6x4x4ft cage and had plenty of room to explore. With proper care and attention he sprouted into a 5ft long 13lb behemoth. Every day he ate two turkey roasting pans full of organic greens and veggies and eventually I had to move into a larger place so he could have a 13x10ft room.
He was the sweetest critter. He never bit, hissed, whipped or did anything aggressive.
Then one day in 2010 (So he was 6-7 years old) we were on the couch watching cartoons and getting ready for a bike ride. I turned and looked at him and said "What are you staring at?" In a split second I nearly lost an eye and I am quite confident that I would be disfigured if I did not shell out thousands of dollars to a plastic surgeon to reconstruct my face.
All I can guess is that he didn't appreciate that my roommate had brought home a guy to stay the night and they weren't introduced. I believe he smelled some pheromones that he didn't like in 'his' territory and acted out.
Unfortunately I tried for about 3 months to get him to calm back down and he remained aggressive. He went to live at a pet store as an example of why iguanas aren't the best pets. He then proceeded to bite two more people and had to be euthanized.
Long story short, I don't recommend them at 'fun' pets. They can be mean son's of b!tches. (I rescued another iguana not long before I got this guy and rehomed him because he had killed 3 cats because he was in competition with them for basking spots) If you want something big-ish and fun I swear by Blue Tongued Skinks. I absolutely love them.
Big Pic: At the SECOND hospital because the first refused to stitch me up (no plastic surgeon on staff)
Top: Me with Dizzy about a month before
Middle: At home a couple days later
Botton: 4 years later and just a couple small scars. I consider myself to be quite lucky.