The brown pelican's recovery from near-extinction due to DDT represents one of the great conservation success stories, demonstrating the power of chemical regulation and protective legislation.
Brown pelican recovery demonstrates how regulatory intervention to eliminate toxic contamination directly improves individual animal welfare at population scale. The reproductive failure caused by DDT-thinned eggshells represented welfare harm across tens of thousands of individuals annually. Recovery restored normal reproductive success and reduced the chronic stress of failed breeding seasons. Ongoing threats including oil spills cause acute welfare harm - oil-covered pelicans experience hypothermia, skin irritation, and impaired diving ability before rehabilitation can address the contamination.