lizard

I just found the CalPhotos site that has this Kentropyx calcarata that's closely related to Ameiva ameiva. The main difference I see is the green stripe down the center of the head. http://calphotos.berkeley.edu/cgi/img_qu...
The checklist for Guyana lists both species: http://botany.si.edu/bdg/guyherps.html

Thanks Harsha.

Great reptile!

Thanks Brendan. I photographed about 10 Ameiva with slightly different patterns, but probably all Ameiva ameiva.

Looks like a juvenile, female Ameiva ameiva (Giant Ameiva). I believe this is one of the only species of Ameiva in your location. Extreme color variation in this species and juveniles are very different in appearance from adults.