I've been keeping track of the fox sparrows since I first noticed them last week. I can't be certain as to how many I have in the proximity of my yard and the neighbor's, but I have seen two at the feeder at one time. Maybe it is just the two of them. They are aggressive and will spar with each other at the feeder and will also shoo away the juncos and other ground feeders who get too close.
Here is another look one of them.