Non-invasive research approaches allow scientific study of wild primate populations without the welfare costs of capture, marking, and sampling that invasive methods require.
Wild primate research has historically required capture and invasive procedures that carry significant welfare costs: anaesthesia risks, handling stress, mark-associated welfare impacts, and the disturbance of established social groups. Non-invasive methods developed over recent decades now enable equivalent or superior scientific outputs without these welfare costs. Faecal DNA provides genetic material for population genetics and kinship analysis; faecal hormones reveal stress and reproductive state; camera traps provide demographic and behavioural data; and systematic behavioural observation by trained observers generates rich individual-level data. The shift toward non-invasive methods is driven by both welfare values and practical advantages — methods that do not require capture are more scalable and generate less confounded data since handling stress does not influence results. Research ethics frameworks increasingly require non-invasive alternatives to be used where they achieve equivalent scientific objectives.