It is easy to neglect the birds that we can see all the time along the roads. The Red-winged Blackbird is present at many places here in Iowa. It is a very dominant bird and can attack humans or other birds that interfere with the territory they claim as theirs.
I checked a place in the Green Island Wetlands for the arrival of its cousin, the Yellow-winged Blackbird, but I couldn't find any so far. It may have been still a few days too early. I hope they will be back again. In the meantime I just enjoy making pictures of the red-winged. ;-)