Chirpy Chirpy Cheep Cheep

This is one of a couple of birds that has built a nest on my front porch. This picture was taken just after the bird had brought some food to the two baby birds in the nest next to my front door. They've gotten used to me sitting on my front porch, because even though I'm barely five feet from the nest a lot of times, they'll fly up, watch me and then I can wave them on toward the nest and they'll go.

I don't know what kind of bird this is, not being knowledgeable about these things, but at times, they can be quite melodic in the sounds they make. At other times, one will fly in, feed the babies, then land on my porch railing like this and call out with a screeching kind of sound three times, (as if alerting it's mate of something), then fly off again in search of more food. They are fun to watch and don't seem to mind me being so close since I don't bother them.