There is really no such thing as “blackbirds”. There are grackles and starlings and Red Wing Blackbirds.
For the record, I recently reported to the Tennessee Ornithological Society two December sightings of an all white grackle.
Typical in the rascist sate of Tennessee! ;-)
I know for a fact there are no blackbirds around my BIL’s house.
The then-wife and I had only been "verbally" abused while walking
in the same area.
A neighbor said he used to have a tree abutting the driveway.
Grackles/Starlings would nest, doodooing up his car, so he
bought a bag of Brazilian nuts or the like, and a slingshot. The
nut was big enough to carom off the branches, encouraging
the flock to leave en mass.