Swine rooting in oak (Quercus spp.) and American beech (Fagus grandifolia) stands indicates that feral swine are competing with native wildlife such as deer and turkeys for important mast crops. We also observed feral swine wallows, or areas of rooting, in and around 1st order streams, seeps, and springs. At one creek bottom in Cortland County there were more than ten wallows. Wallows were documented in ephemeral pools, on pond edges, or in small wetlands in the three counties where we trapped. In areas where swine density was high, they disrupted or destroyed large areas of natural plant communities, leaving only bare, compacted soil. There is little doubt that feral swine adversely affect forest regeneration and alter plant community structure on a local scale in their New York range; the magnitude of the impact depends on the population of feral swine.Feral swine represent a novel predator for countless other species in New York State. Feral swine readily prey upon important game species such as eggs, nests, and offspring of upland birds and deer fawns, as well as small mammals, fish, amphibians, and invertebrates