Phoebes can be attracted to your yard by building a small wooden shelf (8 by 8 inches) under the eves of exposed parts of buildings. Keep the shelf about 12 inches below the eves to allow room for the nest of mud. They will also respond to the same nesting box built for the American robin. The female usually builds the nest. The nest is composed of moss, mud, feathers and grass. The female lays five eggs and the incubation period is 16 days. The females do most of the setting.