Deer populations in Britain have expanded significantly without natural predators. Managing welfare for both deer and other wildlife requires understanding the ecological context.
Wild deer welfare exists in tension with ecological welfare of the wider habitat. Without natural predators, deer populations can grow beyond the carrying capacity of their habitat, leading to overgrazing, habitat degradation, and the starvation of the deer themselves in hard winters. Individual deer welfare is affected by vehicle collisions, agricultural injuries, disease, and inhumane culling methods. Humane culling to maintain sustainable populations is a welfare intervention that prevents starvation and maintains the habitat quality that benefits all species. The reintroduction of wolves or lynx as natural regulators is debated as a longer-term ecological welfare solution.