I photograph all the lizards around here quite a bit. I'm still trying to get the hang of using the new Sigma. So far I haven't had any really great light and unfortunately it seems the reviews I saw about the Sigma being a bit weak in low light are pretty accurate. I guess I am not too surprised there. Most of the zooms I've tried manual or AF have been that way.
These were actually done near the library the other day and most of them were under trees so they are bit darker than I'd like. I like these shots though. Lots of texture and some interesting things going on with the one lizard's chin. I forget what they call that thing, but I just love it when they puff up like that and pump up and down like little bodybuilders, laugh.
(Again, I do use a watermark such as it is. I know a lot of people hate them, but I feel it's better than nothing...)