Simply put, suet is rendered beef fat that is usually offerred in a square cage called a suet feeder. Because it is so high in calories and protein, it helps provide the energy birds need to make it through the colder temperatures of fall and winter. And although we carry many different suet flavors, the primary ingredients (after the actual suet) in most of them are peanut or peanut butter, combined with insects, fruit, or sunflower meats.
Most people offer suet because it is particularly attractive to woodpeckers, but suet is also popular with nuthatches, chickadees, and bushtits (those large flocks of tiny, grayish birds that descend into your yard).