Wander around the garden in Houston and there is usually the odd small lizard, a few inches long, scuttling out of sight or sunning itself on a wall. There seem to be two sorts.
The green anole (left) is native to the south eastern US. They have the ability to change colour to brown, hence sometimes called American chameleon, but these are not true chameleons. Their natural habitat is trees, although house walls seem to provide an alternative.
The brown anole (top right) is a native of the Caribbean, more recently introduced via pet shops and pot plants. This lizard is said to displace green anoles from their preferred habitat, so represents a threat to their long-term survival.
My third picture (bottom right) is probably a brown green anole, as it lacks the strong patterning of the brown anole.
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For reference here is a list of reptiles in Texas.