The extent of deer damage can be monitored through direct and indirect observation. Deer might be "caught in the act" during their active periods in the evening and early morning. Indirect observation involves recognizing signs that deer leave behind.
Lacking upper incisor teeth, deer characteristically tear off vegetation, leaving jagged edges that identify browsed trees. In comparison, browsing by rodents and rabbits leaves a clean-cut surface. The height of the damage, however, might be the only factor necessary to eliminate any mammal other than deer. Another method for determining the source of damage is to search for tracks. Deer leave a distinctive split-hoofed track that can easily be seen in damp soil or snow. Monitoring your fruit plantings for damage is an important, ongoing process and the first step in a successful management plan.