I have gone through my "Field Guide to Birds of North America" twice and I am still not certain what one of these two species is~

OK, so I have a slight challenge here in that I have gone through my "Field Guide to Birds of North America" twice and I am still not certain what one of these two species is.  Thus... any help out there would be appreciated.  The first set of photographs at the bottom is of a Field Sparrow.  The two photographs at the top of this post, I would guess is a species of Sparrow, just not certain which one~

The wee Carolina Wrens are a good friends to the other song birds in our yard~

The wee Carolina Wrens are a good friends to the other song birds in our yard. They have to be a little be more selective in the type of seed they eat, due to their size among other reasons. Thus, when they come to the feeders, they will pull out what they do not desire and throw it to the ground. Then of course there are other birds waiting and ready~