(Photo courtesy of Epi Shemming and Cornell Lab of Ornithology)
We frequently see them perched on a fence post or other low perch from which they make short flights to capture insects, often returning to the same perch. They like to use a shepherd's crook plant hanger near the porch where the nest is.
The nest is made of mud, straw and grass. It is an amazing feat of engineering which was built in about 2 days time.
The female laid 4 eggs in the nest. There were five, but apparently one of them got broken. You can see shell remnants clinging to one of the other eggs. This picture makes the eggs look much larger than they actually are. In fact, they are only about half an inch long.
The parents were kept busy feeding them and they grew quickly. After 3-4 days, they looked like this.
And then early one morning they fledged. I was able to get this picture of two of them before they were gone.
Cornell's All About Birds website is a great resource for identifying and reading about birds.