In reference to using black oil sunflower seed. I have 14 feeders, 4 have black oil sunflower, 3 have safflower, 2 have Niger, 2 have peanut splits, 3 have suet and the I put on the ground, millet, corn and some black oil seeds. When 100 to 200 Grackles and red wings get through, I might have some Niger and some safflower. I believe someone said they can't crack the sunflower. I don't know if they crack them or swallow them for later, but everything is gone when they leave and most of the other birds sit in the trees and watch. These are the culprits, there are three different feeders in one picture, black oil, suet, and peanuts. Raincrow
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