These data were collected for the purpose of determining potential ecological costs associated with a mitigation strategy used in shale gas development in the Appalachian basin. Collocation is the practice of siting new shale gas pipelines adjacent to existing surface disturbance such as forest roads to reduce habitat fragmentation and loss of core forest. These data result from spot mapping for species of songbird at paired forest road and shale gas corridors (expanded access roads collocated with pipelines) between May and July 2013 in north-central Pennsylvania, USA. The data file contains nine sheets that report data from different pieces of the response of four species of songbirds to the two types of forest-dividing corridors. Sheet 1 "AllSpp Cross" reports the frequency that all three territorial species to cross the right-of-way (ROW) corridor. Sheet 2 "BHCO Abundance" reports Brown-headed cowbird (BHCO) abundance within study sites. Sheet 3 "Point Distance" reports the distance from all individual bird detections of territorial focal species to the nearest right-of-way (ROW) edge. Sheet 4 "Territory Density" reports the territory density for all three territorial focal species. Sheets 5-8 are README files associated with each of the data sheets to describe the data in greater detail.

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