What kind of birds are these?

I am currently residing in north-central Texas, and I enjoy a little bird-watching show out of my balcony. I can't really identify their species, though. I thought originally that perhaps these tiny finch-like birds were chickadees or house sparrows, but they don't quite look like either. The males have have black-capped heads, bronze-brown and scalloped backs, with grey bellies and a white strip on their wing, and relatively long thin tail. The females are brown speckled and also have a grey belly, although somewhat lighter. Their call is a very high-pitched, short, *chirp*, which my parakeets imitate quite well. Do you know this species?