How can I effectively get rid of blackbirds at feeders?

To effectively get rid of Blackbirds at feeders, you can try using feeders with smaller openings that blackbirds can't access, using feeders with weight-sensitive perches that close when a heavier bird lands on them, or using physical barriers like netting or cages around the feeders. It's also important to remove any spilled seed on the ground that may attract blackbirds.