It could be a number of birds (a picture would have been nice... or some description of the size... or something other than it's coloring..-__-)
So I'll shoot in the dark here:
Golden-bellied Fly Catcher
Some type of Warbler
Wren
Or the American Gold Finch.
Maybe I helped with your vague description of what MIGHT be a bird?
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It is probably a Red-winged blackbird. In the New England area at least, the red bands are not very prominent when the bird is on the ground but show up when the bird takes flight.