The American robin, Turdus migratorius, is the largest and most common American thrush.
Males stake out their territories before the females arrive, singing love songs to attract a mate.
While the males are singing, the females begin nest construction. One of the earliest birds to migrate in the spring, it usually returns to the same area year after year. Grass, twigs, string and other found materials are mixed with mud to build the robin's cup-like nest. The female normally lays between three and four eggs in that famous light blue color. The hard shells of birds' eggs perform the vital function of protecting the developing embryo during incubation.