The Songbird Essentials Birdie Bell with Nesting Material Bird Feeder (SEWF91010) is an all-around, weather resistant feeder which can hold a variety of treats for your birds. This can carry seed bells, fruits like orange halves and apple slices, suet. Also, to bring more birds into your yard, aside from using just a cotton, this automatically includes 5 natural-colored nesting materials: feathers, string, hemp, cotton and aspen fiber. To load, simply push the clip on bottom of the holder to open the bell to place. This is perfect to accommodate Orioles, Finches, Robins, Wrens, Bluebirds, Chickadees and all other species of North American birds. Have a wonderful bird viewing experience.