White-tailed and other deer species have reached overabundant population levels in many regions due to predator removal and habitat change. Managing deer welfare requires balancing individual and population-level considerations.
Deer overabundance creates welfare challenges that play out at both individual and population levels. Individual deer in degraded, overcrowded habitat experience chronic food insecurity, increased disease burden, and higher parasite loads. During severe winters, population crashes involving mass starvation cause widespread acute suffering. Deer-vehicle collisions cause traumatic injuries that may result in prolonged suffering before death. The solutions to deer overabundance — hunting, immunocontraception, and predator reintroduction — all involve welfare trade-offs. Hunting causes acute suffering but reduces population-level suffering from starvation and disease. Immunocontraception involves handling stress but avoids lethal intervention. Each approach requires careful welfare analysis to determine the best outcome for the greatest number of individual animals.