Brown pelicans were driven to near-extinction by DDT in the 1970s and have recovered through conservation — offering lessons about the welfare costs of environmental pollution on wildlife populations.
The DDT-caused pelican collapse represents a slow-motion welfare catastrophe — breeding adults incubating eggs that crumbled beneath them season after season, colonies collapsing as reproduction failed. Individual birds continued to engage in nesting behaviors that could no longer produce offspring. The harm was environmental, invisible, and cumulative. The recovery story demonstrates that environmental harms to wildlife have welfare dimensions beyond population statistics — each failed breeding attempt represents behavioral frustration and ultimately a population unable to sustain itself.