My favorite thing about the dinosaur lizards is how multi-colored they are in the sun. The sides of the males, especially, are adorned with blue and green spots, but vibrate in the sun, giving them a rainbow-sided look.
Of course, they aren't really dinosaur lizards. They are, in fact, Puerto Rican Ground Lizards, or some close relative thereof. They are a type of ameiva, and I haven't been able to find much information on them. The El Yunque link indicates that these guys only grow to about 8 inches from snout to vent, but I have definitely seen larger specimens than that here.