American robins typically lay three to five bright blue eggs in sturdy cup-shaped nests they’ve carefully crafted from mud, grass, moss, and twigs. The female sits on the eggs while the male brings her food and defends the nest area. The eggs hatch in about two weeks. While they incubate, the babies transform from prehistoric-looking featherless creatures that are nearly all gaping yellow beak, to tufted, speckled fledglings ready to leave the nest. During the spring and into the summer, a pair of American robins may raise up to three nests of baby robins.