Gecko behavior. I've only seen green geckos. Good photo.
Looks more like an "alligator lizard" to me. Anyone know for sure?
That seems right. The Southern alligator lizard (Elgaria multicarinata), according to Wikipedia, "can frequently be found near human habitation and are notable for their fearless self-defense," but make good pets. They eat things like slugs, crickets, and birds.
And their jaws are very strong...I can't remember which of my kids you could ask about that, but I believe it might be David. No blood, just hanging on to a finger.