🪄🔮 Being part of a much larger family of birds- Blackbirds have a wide variety of folklore and spiritual meaning across the world:
Blackbirds have always had a bit of a mysterious reputation in folklore, showing up across cultures as messengers between the living and the dead or between our world and something more supernatural. The Celts were especially enchanted by their song, believing it could put you in a trance or even whisk you away to the fairy realm if you weren’t careful. 🧚
Across Europe, spotting a blackbird could mean anything from bad luck to impending death, though some people thought of them as protective spirits keeping watch over the household. From Norse mythology to Native American traditions, these dark birds were tied to magic, transformation, and the ferrying of souls. 
These are my personal correspondences for Red-winged Blackbirds:
🖤Protection- they will defend their territory from much larger predators and invaders including Great Blue Herons, Red-tailed Hawks, horses and humans. They relentlessly dive bomb and chase of anyone that may be a threat to the nests and nestlings hidden in the cattails and grasses of their territories. 
❤️Confidence- males spend much of their day singing loudly and chasing off competitors. 
💛Boldness- from their behavior to their bright red and yellow epaulets, this bird will not make itself small for anyone or anything.  
🖤Community- in nesting season many females build their nests in one area and the entire group works together to fend off raiders and competitors. In winter,  related and unrelated flocks come together at seed sources like hay stacks and grass fields. 
Red-winged Blackbirds are one of the most gregarious and spicy of the songbirds. The males are highly vocal and highly visible during the nesting season. Their distinctive “konk-ka-ree” song can be heard in marshlands and pastures where cattails or grasses provide the structure needed for females to build their well hidden nests. 
I’m always amazed by how much care and effort birds put in to creating their nests. That they build them with their feet and their beaks is all the more astonishing. 
All About Birds describes the nest building process like this ⬇️:
Females create their nests by winding stringy plant material around several close, upright stems and weaving in a platform of coarse, wet vegetation. Around and over this she adds more wet leaves and decayed wood, plastering the inside with mud to make a cup. Finally, she lines the cup with fine, dry grasses. 
One nest picked apart by a naturalist in the 1930s had been made by weaving together 34 strips of willow bark and 142 cattail leaves, some 2 feet long. When finished the nest is 4 to 7 inches across and 3 to 7 inches deep.
They are shorter distance (around 800 miles) migrants with some southern populations not migrating at all. 
You can hear their song and learn more about them here: https://www.allaboutbirds.org/guide/Red-winged_Blackbird/overview