According to the sanctuary’s brochure:

The Fred Dill Wildlife Sanctuary is covered by an upland deciduous hardwood forest. This forest is dominated by oak, hickory, ash, maple, beech, birch and tulip. Native tree seedlings and shrubs are lacking the the forest understory due to being browsed by deer. Deer have not evolved to browse on invasive species such as Japanese barberry…By browsing on all of the native vegetation, deer have helped to spread invasive plants in the region. However, the forest still provides habitat, food and water that attract deer, turkey many other birds, small mammals, reptiles, amphibians and insects.