Living World Nesting Material satisfies the natural urge of birds to build nests by providing fiber for nest building. The soft lining material provides maximum comfort for breeding and raising hatchlings. The nesting material comes in a box with a perforated access hole for your bird. The box has two clips that allow you to fasten it to the bird cage. Just prior to your bird's mating season, install the box inside the cage, open the access hole, and pull out a small amount of nesting material. Your bird will find the nesting material and begin to line its nest.