This is because of sub-species, genetics, or geographical location. Back in the 80s I caught a 7 foot 2" male green iguana with about what could have been 6" missing from the end of the tail. There were other iguanas on that canal bank there were larger. I also worked for a reptile importer; Pet Farm where we received a shipment of 7 foot common iguanas from Nicaragua. In another particular location, I remember setting my eyes on an adult male "Blue" green iguana that had to be close to 6 ft in length. Most if not all of these iguanas were Iguana, iguana, rhinolopha from Honduras and Nicaragua which grow bigger than the ones being imported today from Peru and Columbia. We had not experienced a deep freeze winter for over 20 years prior to the one that wiped all those animals out. We still have some of the remnant rinolopha iguanas here but some of the original bloodlines have been diluted due to cross breeding of newly introduced iguanas form other locations. I still come across 6-1/2 ft iguanas here in Florida from time to time. I have never caught or seen another one as massive as the 7'-2" I caught in the 80s and this may be because of the cold snaps that have been happening every 10 to 15 years that kills off most of the older populace and does not allow them to grow to their maximum capacity.

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