Seabirds across all ocean basins are ingesting plastic debris, causing internal injury, malnutrition, and death. The welfare impacts on individual birds are severe and the scale of the problem is enormous.
Ingested plastic causes multiple welfare harms in seabirds. Physical blockage of the gut causes a false sense of satiation, meaning affected birds stop foraging while slowly starving. Sharp fragments cause internal lacerations and bleeding. Toxic chemicals leaching from plastics disrupt endocrine and immune systems. Chicks fed plastic by parents who mistake it for food experience these harms during their most vulnerable developmental period. The suffering of individual seabirds from plastic ingestion is invisible but widespread and severe.