Greater white-fronted goose, Anser albifrons.Black-bellied whistling-duck, Dendrocygna autumnalis (A).(Ex) Extirpated – Species which no longer occur in Pennsylvania but are found elsewhere.
(X) Extinct – Recent species that no longer exist.(I) Introduced – Species established in North America as a result of human action.(P) Provisional – Species accepted by the PORC with only sight records.(C) Casual – "casual or increasing vagrant" per the PORC.(A) Accidental – "generally fewer than five modern records" per the PORC.These tags are used to annotate some species: Unless otherwise noted, all species listed below are considered to occur regularly in Pennsylvania as permanent residents, summer or winter visitors, or migrants. 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. 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). An additional nine species are classed as provisional and are also classed as accidental. Of them, 80 are classified as accidental, 59 are classed as casual, six have been introduced to North America, two are known to be extinct and another might be, and two have been extirpated. As of May 2021, there were 439 species on the official list. state of Pennsylvania and accepted by the Pennsylvania Ornithological Records Committee (PORC). This list of birds of Pennsylvania includes species documented in the U.S. The ruffed grouse is the official state bird of Pennsylvania.
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