This 100% seed block is excellent for squirrel prone areas, as squirrels generally don’t like safflower. These blocks are preferred by cardinals, grosbeaks, and more, while grackles, sparrows, and starlings generally don’t like safflower. Golden Safflower, also known as NutraSaff, is a safflower hybrid specifically developed for bird feeding to have a thinner hull (40% thinner) and higher levels of oil (15% more), protein (25% more), and fat (30% more) than traditional white safflower. It's easier and healthier for your birds to eat, and studies show that birds prefer it 2 to 1 over traditional safflower! It also tends to deter squirrels, grackles, and starlings with its bitter taste, although some individuals may adapt and eat it with time or in desperation. Attracts: Cardinals, Jays, Chickadees, Nuthatches, Grosbeaks, Titmice, Doves, Finches (House, Purple), Downy Woodpeckers, and Chipmunks; occasionally House Sparrows Offer these in a suet cage, large suet feeder, or on a platform feeder;, it can’t be kicked all over the place like loose seed can. The large size lasts a long time and attracts loads of birds. No waste, no mess, no melt. Made in the USA.