What are some ways Galapagas iguanas and South American iguanas are different?

Galapagos Iguanas feed mostly in sea water, off the rocky coasts of the Galapagos. (Aka Marine Iguanas). South American Iguanas or Green Iguanas live in areas of dense forest and vegitation, and spend most of their time basking high in trees.

There are also Galapagos Land Iguanas, just sayin'.