Most red-winged blackbird nests are near water, cattail marshes, or wet meadows. Their nests are cup-like creations of leaves and grass woven around branches, stems, and reeds. They pack the nest with mud before lining it with layers of dry grass or rushes.
You can experience change through time and variation across space at the same time by starting at the water and walking inland. Because of the way this ridge plain formed, the beach is the youngest environment. As you walk away from it, each ridge you cross is older than the one before. Older ridges have supported vegetation longer than the ones before them and typically have more species.