Assessing pain and suffering in wild animals poses unique challenges — remote sensing, behavioral indicators, and physiological markers are key tools.
Assessing welfare in free-living wild animals is one of the most methodologically challenging areas of welfare science. Animals in the wild have strong evolutionary incentives to mask pain and disability — appearing weak invites predation. This means that conventional visual behavioral assessment dramatically underestimates pain and suffering in wild populations. Remote sensing technologies are changing this: GPS tracking detects movement impairment, thermal imaging identifies inflammatory responses to injury, and fecal glucocorticoid analysis reveals physiological stress without capture. These tools are enabling a new understanding of the prevalence and severity of pain in wild animal populations — from roadside deer with leg injuries to marine mammals entangled in fishing gear. Building monitoring capacity across wild populations is essential for evidence-based wild animal welfare interventions.