Grey herons have adapted successfully to urban environments across Europe, but urban-specific hazards including fishing line entanglement, lead poisoning from discarded weights, and vehicle strikes create welfare challenges for these large wading birds.
Urban grey herons occupy a successful ecological niche but face human-created hazards at higher rates than their rural counterparts. Fishing line entanglement is particularly welfare-damaging because entangled birds suffer for extended periods before death or rescue — lines tighten as birds struggle, cutting into tissue and causing progressive injury. Lead poisoning from ingested weights causes neurological deterioration over days to weeks. These welfare harms are entirely preventable through simple changes to fishing practices: using lead-free weights and disposing of line responsibly. Wildlife rehabilitators in urban areas spend significant time treating injuries that proper disposal practices would eliminate.