This list of birds of Illinois includes species documented in the U.S. state of Illinois and accepted by the Illinois Ornithological Records Committee (IORC). As of March 2024, there are 455 species and two species pairs included in the official list.[1] Of them, 92 are classed as accidental, 38 are classed as casual, nine have been introduced to North America, three are extinct. The native populations of five species have been extirpated though some of them have been reintroduced. An additional accidental species has been added from another source.
Only birds that are considered to have established, self-sustaining, wild populations in Illinois are included on this list. This means that birds that are considered probable escapees, although they may have been sighted flying free in Illinois, are not included.
This list is presented in the taxonomic sequence of the Check-list of North and Middle American Birds, 7th edition through the 62nd Supplement, published by the American Ornithological Society (AOS).[2] Common and scientific names are also those of the Check-list, except that the common names of families are from the Clements taxonomy because the AOS list does not include them.
The following codes are used to designate some species:
(A) Accidental - "Species for which there are accepted records in no more than two of the past ten years" per the IORC
(C) Casual - "Species for which there are accepted records in three to seven of the past ten years" per the IORC
(I) Introduced - Species established in North America as a result of human action
(E) Extinct - a recent species that no longer exists
(Ex) Extirpated - "Species which were formerly casual or regular in Illinois but which have not been recorded in the wild in the state for at least 50 years" per the IORC
^"The Birds of Illinois". Illinois Ornithological Records Committee. March 2020. Retrieved August 10, 2021.
^"Check-list of North and Middle American Birds". American Ornithological Society. June 29, 2021. Retrieved August 9, 2021.
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