Poop?

This is an American five-lined skink. A juvenile (blue tail). I took a bunch of photos of it as it moved around on a rock by our chimney. It wasn't until I looked at them on my laptop that I realized that the thing it had been doing - moving its back legs around and then lifting its tail - must have been pooping! I guess that's what that brown and white blob under its tail is. Not something I see every day.