Acton Birds

We had a Carolina Wren living in our backyard this week.  Not sure if it is still around, but we saw it lunch time on our deck and then heard it for the next couple of days.  It is a loud bird.



Went up to North Acton today. 
Lots of birds at the shooing range.  Goldfinches, Red-winged Blackbirds, Nuthatches, etc.  There was a Killdeer, which I've seen there before.  And there was a bunch of birds I'm not sure about.

One I'm pretty sure was a female Yellow Warbler.



It didn't have any of the red stripes on its breast, so that is why I say female.

Then there were some birds that seemed to be blue on top and yellow on the bottom.  One seemed like a juvenile whose yellow was splotchy.  I can figure out what they were.  It doesn't seem to match anything I can find.
I also think I saw a belted kingfisher, but can't be sure on that either.  It was pretty far away.