Brown pelicans were nearly eliminated from the Gulf of Mexico by DDT-caused reproductive failure in the 1970s. Their remarkable recovery is a conservation success, though new threats including oil spills and plastic ingestion have emerged.
Brown pelican welfare depends on the integrity of their coastal nesting habitat and the cleanliness of their marine foraging environment. Individual pelicans entangled in fishing line suffer wing injuries that ground them and prevent feeding - a welfare emergency requiring rehabilitation. The Deepwater Horizon oil spill caused acute welfare harm from oil coating that destroys waterproofing and thermoregulation while causing toxic internal effects. Oil spill response including wildlife rehabilitation provides welfare intervention for individual birds while longer-term cleanup restores habitat. The story of pelican recovery demonstrates that removing the proximate cause of population decline (DDT, then oil) and providing habitat protection allows resilient species to recover.