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Species who breed in the state and do not migrate (or migrate very little) and remain year-round. Ie. Tufted Titmouse, Downy Woodpecker, Wild Turkey.
Year-round Resident and Migrant
Species who breed in the state, some of whom migrate, but whose northern and southern populations overlap, therefore creating an appearance of permanent status, but individuals in the summer are often different than the winter birds. Ie. Red-tailed Hawk, Purple Finch.
Migrant and Breeder
Species who breed in the state, but leave the state for winter. Ie. Most warblers
Migrant and Winter Resident
Species who do not breed in the state, but arrive in the fall and spend the winter. Ie. Common Redpoll, Rough-legged Hawk.
Species who neither breed nor winter here, but just pass through during spring and fall migration. Ie. Connecticut Warbler, Least Sandpiper.
Out of Range
Species whose normal range do not include Pennsylvania, but somehow show up here. Ie. Western Kingbird, any hummingbird other than Ruby-throated, Ancient Murrelet.
Alternating abundance bars indicates large variations in abundance from year-to-year.
Abundant: 100 + per day
Common: 26 to 99 per day
Fairly Common: 6 to 25 per day
Uncommon: Up to 5 per day, up to 25 per season
Rare: 1 to 5 per day, up to 5 per season