European Starlings preferred diet is insects and berries but they will feed from suet and seed feeders. Their beaks are softer and not designed for cracking hard-shelled seeds. Seeds out of the shell, peanut pieces and suet are easier for them to eat.
To deter starlings, use Bye-Bye Starling, which features all hard-shelled seeds including black oil sunflower, safflower and striped sunflower. Another seed option is to use only white safflower in the feeder which also deters grackles and Red-winged Blackbirds.
Avoid any seed mix with milo as blackbirds seem to be the only ones that eat it! Serving a straight seed like black oil sunflower, white safflower or Nyjer also keeps birds from picking through the seed for their favorites as they do with seed mixes.
Other tips: use in-shell peanuts rather than peanuts out of the shell. Don’t put out kitchen scraps, bread, crackers etc.