• Nearly 2,000 dedicated birdwatchers contributed to the surveys of breeding birds
• Every one of the state’s 4,937 blocks was surveyed during the period from 2004–2009. 
• Over 106,952 volunteer field hours and another 34,192 administrative hours comprised the effort
• The current distribution and changes since the first Atlas were mapped in detail for 190 breeding birds in Pennsylvania (see Results – Species Maps)
• In addition, a rigorous, innovative point-count bird survey protocol was conducted at more than 34,000 locations statewide, providing additional data on population size.
• The published work (see Purchase tab) provides a stunning compilation of information, including species accounts illustrated by an impressive photograph, up to three maps per species, a chart showing 40-year population trends, introductory chapters, and hundreds of tables and charts.

Species highlights

• Confirmed breeding in the state for the first time: Merlin, Great Black-backed Gull, and Eurasian Collared-Dove.
• Expanded their range dramatically:  Canada Goose, Wild Turkey, Red-bellied Woodpecker, Pileated Woodpecker, Carolina Wren, and Hooded Warbler.
• Declined precipitously:  Summer Tanager, Black Tern, Common Nighthawk, Blue-winged Teal, and Northern Bobwhite.
• Estimated to have greater than 3 million pairs nesting within the state:  Red-eyed Vireo, Chipping Sparrow, and Song Sparrow.