The scientific evidence is clear: white-tailed deer overabundance is a threat to millions of acres of forest land in the Northeastern United States. As keystone herbivores, whitetails can have disproportionately large impacts on biodiversity and forest dynamics. Impacts may be obvious or may cascade through the ecosystem in ways not fully understood. This document provides additional guidance on reconnaissance-level assessment of deer impacts. The focus is on the plant life. Most examples are drawn from New England and New York.