Advanced wild animal welfare science is developing methods to assess affective states — emotional wellbeing — in free-living animals beyond injury and disease measures.
Wild animal affective state welfare science challenges the assumption that free-living animals are by default in good welfare simply because they are wild. The ability to measure stress hormones, observe play, and assess behavioral indicators without capture creates a welfare monitoring capacity that was previously unavailable. Research showing that individuals in high human-disturbance areas have elevated fecal glucocorticoid levels — indicating chronic stress — even in apparently healthy populations demonstrates that population health metrics miss important welfare dimensions. This science is maturing rapidly and will increasingly inform conservation management decisions.