Imagine a change in the iguanas have it from dryland to aquatic. Based on the genetic one allele frequency‘s, we can assume only a small percentage of iguanas had web feet and were able to survive. Over many generations if their habit remains aquatic iguanas without web feet will disappear from this population. Scientist eventually distinguished two species of Aguado is, one that has feet with the webbing that lives on land in the other that has web for feeding, Living in and around aquatic habitats