Citizen science programmes that engage volunteers in wildlife monitoring are generating data that supports conservation and welfare interventions at scales professional researchers cannot achieve alone.
Citizen science programmes generate welfare-relevant data at scales impossible for professional researchers -- tracking population trends that reveal where welfare interventions are most needed, identifying hotspots for road mortality, documenting species range changes driven by climate and habitat loss. For advocates, citizen science provides both data for campaigns and a mechanism for public engagement that builds the constituency of people who care about wildlife. Contributing to citizen science is one of the most impactful things an individual can do for evidence-based welfare advocacy.