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
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
Pennsylvania Game Commission
website for current information on the
regulatory status of any of these species in Pennsylvania.
For more information on Invasive Species of National concern visit the
National Invasive Species Information