Droll Yankees
Hungry birds will adapt as best they can to the conditions in order to survive and larger birds will sometimes hang onto the collapsed perch and continue to feed. It is uncomfortable for them and difficult so it discourages them but might not be the ultimate preventative.
Black Oil Sunflower
WILD DELIGHT NUT N' BERRY WILD BIRD FOOD
Concerto
Blue Seal Fine Cracked Corn
Song Maker Supreme