Of these 572 GCN, 41 are mussels, 52 are snails, 4 are crayfish, 312 are insects, 69 are fish, 15 are amphibians, 22 are reptiles, 44 are birds and 14 are mammals. Problems or threats to the GCN species populations in Pennsylvania are commercial and industrial
development, landfill construction or operation, dams, road construction, urban development, water diversion, municipal and industrial point source,
commercial harvest, conversion of riparian forests, excessive non-commercial harvest or collection, channel maintenance and confined animal operations. Other problems or threats to GCN species are crop production practices, excessive groundwater withdrawal, fire suppression, management of or for certain species, channel alteration, exotic species, parasites, pathogens, recreation, grazing, predation, forestry activities and resource extraction. The Pennsylvania Comprehensive Wildlife Conservation Strategy has addressed these problems or threats to the GCN species population with wildlife conservation actions. These wildlife conservation actions include decreasing the data gap by gathering more information on GCN species, by fire management with controlled burns and with habitat protection by initiating projects to protect existing key habitat or habitat components. Key habitat restoration and improvement by initiating projects to restore or enhance existing habitats and with land acquisition by purchasing land or conservation easement that is important to GCN species are also included in the Pennsylvania Comprehensive Wildlife Conservation Strategy.