Pure safflower seed is a favorite of many songbirds, but disliked by squirrels and nuisance birds. If you have a problem with starlings, squirrels, grackles or other blackbirds, give safflower seed a try. 
 
Works well in hopper and platform feeders.
 
Comes in resealable bags for continued freshness.
 
Intended for use as a treat for wildlife.  Not for human consumption.