how many species of birds in the us
List of birds of the United States This list contains 1105 species. Of them, 135 are tagged as accidental, 95 as casual, and 57 as introduced. Thirty-three are known to be extinct and one, the thick-billed parrot, has been extirpated though a population remains in Mexico. Thirty-three living species are endemic to Hawaii and an additional 28 former endemics are known to be extinct. Fifteen species are endemic to the 48 contiguous states.