Nests are huge, bulky affairs constructed of branches and sticks and lined with twigs, grasses, sod, rags, and paper. Though they may be reused year after year, breeding birds will add to the structure each season. Particularly old nests have grown to over 2 m in diameter and nearly 3 m in depth. Some nests have been in continuous use for hundreds of years. Both males and females participate in nest construction with the male bringing most of the material. Completion of the structure is often signaled by the addition of one leafy branch to the edge of the nest.
