"Mountain lions (Puma concolor) were previously endemic across Pennsylvania. The species was officially declared regionally extinct in 2011 by the , although the last time that a mountain lion was observed east of the was in Maine in 1938, excluding the current population that resides in Florida. The Northeastern population of P. concolor has been almost nonexistent since the early 1800s, most likely due to targeted hunting depredation by farmers to protect livestock, along with habitat destruction and fragmentation. The last documented observation of P. concolor in Pennsylvania specifically was in 1874."