Many backyard bird lovers use safflower seeds in feeders. What Birds Eat Safflower Seeds? These seeds attract lovely birds but keep away pests like squirrels and grackles. Cardinals, chickadees, nuthatches, titmice, house finches, and grosbeaks all enjoy safflower seeds. These seeds are rich in fat and protein, making them an excellent energy source, especially during colder months. Their bitter taste keeps pests away, so songbirds enjoy the seeds primarily for their nutrition.