Acoustic Monitoring of Wildlife Welfare and Stress

Bioacoustics — the study of sounds produced by animals — is emerging as a powerful non-invasive tool for monitoring wildlife welfare, detecting stress responses, and assessing population health at landscape scale.

Key Facts

Animals produce vocalisations that encode information about emotional state, identity, social relationships, and environmental conditions
Stress vocalisations have been characterised in many species including pigs, cattle, chickens, and several wildlife species
Passive acoustic monitoring using remote microphones can detect animal presence, behaviour, and stress indicators without human presence that might cause disturbance
Machine learning algorithms trained on vocalisation data can identify species, individual animals, and behavioural states from continuous acoustic recordings
Noise pollution from roads and industrial activity has been shown to impair acoustic communication in birds and marine mammals, with welfare and fitness consequences
Elephant infrasound communication — at frequencies below human hearing — can be recorded and analysed to assess social group cohesion and stress
Bioacoustic monitoring is being developed as a welfare assessment tool for commercial livestock through automated analysis of vocalisation patterns

Welfare Considerations

Acoustic monitoring represents a genuinely promising welfare science development because it offers non-invasive, continuous assessment of animal emotional states at scales ranging from individual animals to entire landscapes. Traditional welfare assessment requires human presence and observation, which both disturbs the animals being observed and limits the time and scale of monitoring. Automated acoustic monitoring can run continuously, cover large areas, and detect subtle changes in vocalisation patterns that indicate stress or positive states without requiring observer presence. For livestock welfare monitoring, automated analysis of pig and cattle vocalisations is already showing practical promise as an on-farm welfare indicator. For wildlife, landscape-scale acoustic monitoring can detect population-level stress responses to environmental changes.

What You Can Do

Support research into bioacoustic welfare assessment tools for both livestock and wildlife
Donate to organisations developing non-invasive monitoring technologies for wildlife welfare
Advocate for quiet zones and noise mitigation in areas adjacent to wildlife habitat sensitive to acoustic pollution
Engage with precision livestock farming initiatives using acoustic monitoring for welfare assessment
Support road noise reduction measures in areas with wildlife sensitive to acoustic disturbance
Participate in citizen science acoustic monitoring schemes for wildlife in your area
Share information about bioacoustic monitoring as a welfare science tool with interested audiences