What I believe (by process of elimination) is a Swamp Sparrow enjoying a seed from our backyard feeder

I’ve been set up for days to capture pictures of birds in our yard at our feeders, but it has taken a while for them to get used to the presence of both the camera and the feeders. When they finally began to feed they were very skittish, and quite difficult to catch between trips to the feeder from the eavestrough and back. This little one today seemed quite prepared to pose. I’ve searched through my reference books and the only thing that fits the description is the swamp sparrow. I’ll revise this post in future if I am able to learn more and if the identification is incorrect.