When we lived in Chicago, I first became acquainted with red-winged blackbirds. The red flashes on the wings are fine but they have a terribly annoying call and they get quite aggressive when you get close to their nests. There are a lot of them in Juanita Bay and I have to say that they are clearly not the sharpest tools in the shed. They build their nests very close to the heavily trafficked areas where people walk. There is a lot of space in the park but they build nests within feet of the boardwalk.
The result of this is that they are constantly freaking out about how close everyone is to their nest. They fly up on to the boardwalk, swoop around the heads of people and land on the handrails right next to you. It is quite fun to have them so close (except when they start with the calls) but you would think that they would have made life slightly easier for themselves by building a nest just slightly further away from everyone!