Iguana verde (Green iguana/Blue diamond iguana)

Great photo! It would be great if you added the spotting to the "Reptiles of Costa Rica" mission:
http://www.projectnoah.org/missions/1589...

I would also say young male iguana, although females might be a little bit more colorful at the beginning.

Thanks a lot bayucca, I was almost sure on Green iguana but this is the first juvenile I see, so I wasn't sure. BTW, I think this is a male (due to the big and ornamented gular fold), am I right? Or does it look the same in females?

Iguana iguana, juvenile. Sometimes they are also called Blue Diamond Iguana. Many juveniles have some nice blue, which they loose again when growing.
http://www.vivanatura.org/Iguana%20iguan...
http://i49.photobucket.com/albums/f282/W...
http://lapassiondesreptiles.forumactif.c...