There are currently 3 non-native, reproducing mammals in Pennsylvania, They include Norway rat, house mouse, and thirteen-lined ground squirrel (Hassinger et al. 1998). Although relatively low, this figure does not imply that invasive mammals are of little concern in the Commonwealth. Rather, it indicates the goals of preventing new introductions and limiting spread of invasive mammals are attainable at this point.

Given reproductive potential and confirmed presence reports, several mammals deserve attention in Pennsylvania's Invasive Species Management Plan. An example is the feral swine. Feral swine cause considerable damage following accidental or intentional introductions. Although the Pennsylvania Biological Survey does not list feral swine as breeding in the state, there is increasing evidence of population establishment in Bedford County. Additional sightings are reported annually in several counties, including Perry and Tioga (reportedly escapees from shooting preserves). Because of high reproductive rates (up to 2 litters of 4-12 young annually) isolated populations could spread rapidly if they remain unchecked (Hassinger, et a. 1998).

Note: The table below contains examples of Mammals with invasive characteristics that are of concern in the World, the Nation, or in the Commonwealth. Please check the Pennsylvania Game Commission website for current information on the regulatory status of any of these species in Pennsylvania. 

 

• Species listed above are just some of the species that were mentioned in the various Council documents published in 2006 and this is not a comprehensive list of invasive species in this group for Pennsylvania.

• Whenever possible, we have linked to a Pennsylvania specific fact sheet or a federal fact sheet.

For more information on Invasive Species of National concern visit the
National Invasive Species Information Center website.