Overabundant deer populations cause ecological damage and significant animal suffering through starvation and disease, requiring thoughtful management approaches that consider both ecological and welfare goals.
Deer overabundance creates genuine welfare problems for the deer themselves — chronic food limitation during winter, high disease transmission rates in dense populations, and the suffering involved in chronic wasting disease. Management that reduces populations can therefore improve average welfare for remaining animals even though it causes the deaths of culled individuals. The welfare calculation favors management that quickly reduces density to sustainable levels over allowing populations to suffer through starvation-driven crashes. Lethal management through hunting remains the most cost-effective tool for large-scale population reduction, while immunocontraception is more humane for individuals but more expensive and difficult to scale. Integrated approaches using both tools have shown promise in specific management contexts.