Wild Kingdom part II -- a new set of birds of building a nest inside our porch

I believe these birds are part of the flycatcher family because they have forked tails, but I'm having trouble identifying them any narrower than that and I could use some help.

It's been fascinating during the past two weeks watching them build their nest.

Constructed with a mixture of mud and dried grass, it's entirely different from the other birds's nest that went up under the garage eaves last month.

Regular Brazosport News readers might recall that those baby birds hatched in that nest were growing up fine until one of the neighborhood cats lay waste to them. [See posts on May 23and May 17.]

(We've since identified the cat. It goes by "Whiskers.")

Back to the new set of birds. I give them credit for their engineering skills, not to mention their "work ethic" to use a cliché from the tiresome sports parlance of our times.

They started by building a thin ledge composed of moist red dirt. That base went up an inch or so, then they started bringing in black moist soil to continue building upward. Mixed into this, of course, is the re bar -- yellowing dead grasses.

They're at it all day from sunup to sundown.

As far as their appearance, you see from the pictures posted here they have a gray belly and chest and a rust-colored patch under their beaks that extends up between their eyes slightly.

Their backs are dark colored. I'd say black, but in just the right light, there's almost a sheen of dark blue in there.

So what are they? Do you know? Can you send this to somebody who knows a lot about birds and find out?

I've gone through many pages of Google images searching "flycatcher birds" and have yet to find a match.