I don't know it's species name and I'm not going to look for it right now, because I'm way behind on a lot of vacation pictures I have. So, I'm going to leave it up to the comments section to tell me the name of this creature. It was over at the Gumbalimba Park by the way.

UPDATE: So after noticing the spikes on the new picture (on the left) I paired as well as on the first picture (on the right), I'm now guessing that this is a juvenile spiny-tailed black iguana. Am I right? Let me know in the comments.