My blackbirds - mostly Red-wings, Cowbirds, and Grackles - arrived yesterday. It's always between March 12 and March 15. They empty out the bird-feeders and move on. Do they remember my feeders from last fall?
People are annoyed with Grackles because they like to poop in swimming pools. They don't bother me at all.
Here's an autumn migratory flock in Sipp's previous back yard: