Rhino Iguana 2019 Hatchlings Males and Females A7 Blood Line Rhino Iguanas have massive Heads and bodies. The head is decorated with horns making them look the most prehistoric Caribbean rock iguanas Rhino Iguanas have massive Heads and bodies. the head is decorated with horns making them look the most prehistoric Caribbean rock iguanas They are very heavy-bodied animals weighing well over 20 Lbs and up to 25 Lbs for some large males. They are a very long-lived animal with lifespans above 60 years and up to 80 years.