Deer overabundance in areas without natural predators creates welfare problems for deer and ecological damage requiring management.
Overpopulated deer herds experience chronic food insecurity, causing malnutrition, reduced reproductive success, and increased disease transmission. Chronic wasting disease spreads more rapidly in dense populations. Habitat degradation from overgrazing reduces diversity for all wildlife. Population management through hunting or predator restoration improves welfare at the population level even while causing individual mortality.