Iguanas possess a row of spines that run from the tip of their heads to the base of their tails. Discover information and green iguana facts with information from a published biologist in this free video on lizards and reptiles. Green, or common, iguanas are among the largest lizards in the Americas, averaging around 6.5 feet (2 meters) long and weighing about 11 pounds (5 kilograms). Green Iguanas are among the most popular reptile pets in the United States, despite being quite difficult to care for properly. In fact, most captive iguanas die within the first year, and many are either turned loose by their owners or given to reptile rescue groups.

Expert: Dr. Alan Richmond
Bio: Dr. Alan Richmond is the lecturer and curator of biology at the University of Massachusetts. He is a well-published biologist and has a special interest in reptiles and amphibians.