This list of United States birds is a comprehensive listing of all the bird species known from the United States as of November, 2010. It does include species recorded in all 50 states.
Continental United States birds most closely resemble those of Eurasia, which was connected to the continent as part of the supercontinent Laurasia until around 60 million years ago. Many groups occur throughout the northern hemisphere and worldwide. However some groups unique to the New World have also arisen; those represented in this list are the hummingbirds, the New World vultures, the New World quail, the tyrant flycatchers, the vireos, the mimids, the New World warblers, the tanagers, the cardinals and the icterids.
Several common birds in the United States, such as the House Sparrow, the Rock Dove, the European Starling, and the Mute Swan are introduced species, meaning that they are not native to this continent but were brought here by man from Europe or elsewhere. Introduced species are marked on this list as (I). There may be species that have individual escapees or small feral populations in North America that are not on this list. This is especially true of birds that are commonly held as pets, such as parrots and finches.