lizard identification

Question
I am just wondering about a lizard that we saw in Panama City Beach, FL.  It was dark brown but was sitting on a gray cinder block so I don't know if it changes colors.  What my dad was curious about was that it appeared to have a raised ridge (like a fin) down its whole back.  We've never seen anything like that.  Any ideas?

Answer
Hello Sherry,

How large of a lizard was that you saw up there?  It could have been a fence lizard, possibly.  Here are a few pictures of eastern fence lizards.  

http://www.wildherps.com/species/S.undulatus.html


Here is a site that has a pretty decent search to where you can pick different characteristics of what you saw, it is pretty neat!
http://www.discoverlife.org/mp/20q?guide=Lizards

I love lizards, there are so many cool species!

Tracie