Not sure if this is the best place to post this, but that's what this forum is for, right?
See these links for a really nice species ID sheet for American Iguanas, and the latest info on invasive Green Iguanas, from IUCN (the International Union for the Conservation of Nature), .
This came across my desk because in Fiji (thanks to a single numb-nuts with a yacht full of pets he didn't keep properly secure) we now have an invasive population competing with our endemic Fiji Banded and Crested Iguanas. I often get asked what problems the new immigrants are causing, so it's nice to have a simple and well-explained document on hand.
American Iguana ID sheet:
http://www.iucn-isg.org/wp-content/u..._15Aug2011.pdf
Info on the problems caused by invasive iguanas:
http://www.iucn-isg.org/wp-content/u...nt_Dec2017.pdf
Lots of other excellent stuff on genetics, husbandry, research and the status of the trade:
http://www.iucn-isg.org/publications...-publications/