ROB O'NEAL/The Citizen
An iguana measuring roughly four feet from tip to tail launches itself into the retention pond near the Key West Police Department Sunday afternoon. The prolific reptiles have taken hold from the Florida Keys to Lake Okeechobee. Among their more interesting defense systems is their parietal eye which is located on top of their head. While this organ cannot discern shapes, it helps the animals detect light and dark from above to avoid aerial attack. Additionally, if attacked, an iguana can drop its tail and flee. Nerve endings allow the tail to continue moving to distract the predator.