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- This list of birds of Connecticut is a comprehensive account of all the bird species recorded from the U.S. state of Connecticut. Unless otherwise noted, this list is based on the checklist produced by the Avian Records Committee of Connecticut (ARCC) dated March 14, 2022, the list used by most birders to track species recorded in the state. This list includes all bird species known to have occurred in the state, including birds that don't breed in Connecticut, such as migrants, winter visitors and vagrants, as well as breeding species and recently extinct and extirpated species. There are about 280 species that are recorded consistently every year in the state. The Atlas of Breeding Birds of Connecticut (1994) listed 173 bird species as confirmed breeders, based on a 1982–1986 survey. An assessment before 2004 estimated the total number of species breeding regularly in the state at about 150. Of the 451 species listed here, 307 are considered ordinary residents or migrants, expected to be encountered regularly if not necessarily annually. Nine were introduced to North America, three are extinct, four have had their local breeding populations extirpated (but two of these are still stocked for hunting), and 139 are considered rare or accidental. Twelve species are included though they have only sight records. 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). 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 tags are used to designate some species:
* (R) Rare or accidental - birds that if observed require more comprehensive documentation than regularly seen species
* (I) Introduced - a species introduced to North America as a consequence, direct or indirect, of human actions
* (X) Extinct - a species that no longer exists
* (E) Extirpated - a species that no longer occurs in Connecticut although populations exist elsewhere
* (S) - Sight record only (en)
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