This is a female Red-Winged Blackbird, looking a lot like a very big sparrow.
Here is Mr. Red-Winged Blackbird.
Here is a poem written about him.
Red-Winged Blackbird
Red-winged blackbird takes the air
Very spruce and debonnaire.
And he flaunts to all beholders
Scarlet feathers on his shoulders.
Grace Taber Hallock (1893 - ?) American