Can Ponies (Equus Caballus) Distinguish Human Facial Expressions?
Authors: Merkies Katrina, Sudarenko Yuliia, Hodder Abigail J
Journal: Animals : an open access journal from MDPI
Summary
# Can Ponies Read Our Faces? New Evidence on Human–Equine Communication Ponies demonstrate a genuine capacity to distinguish between live human facial expressions, responding differently to anger, joy, sadness and neutral expressions through specific ocular and behavioural markers—a finding that extends our understanding of cross-species emotional communication beyond photograph-based research. Two trained actors presented standardised facial expressions (using the Facial Action Coding System) to twenty ponies whilst researchers recorded eye lateralisation, gaze duration, approach latency and heart rate responses; notably, ponies exhibited left-eye preference when viewing angry expressions and right-eye preference for joyful ones (p = 0.011), and spent significantly longer visually attending to angry faces compared with other expressions (p = 0.0003). Interestingly, heart rate remained stable across all expressions, suggesting that whilst ponies process facial emotional cues cognitively, this does not immediately translate to measurable physiological arousal—though individual handler differences proved far more influential on pony behaviour than expression type, with one actor consistently eliciting increased latency to approach and oral behaviours regardless of their facial expression. Experience level substantially shaped responses, with lesson ponies displaying lower baseline heart rates, lower head carriage and increased oral stereotypies, indicating that habituation to human interaction modulates both autonomic and behavioural reactivity. These findings underline that effective equine handling extends beyond facial expression alone; handler consistency, experience-related expectations and individual rapport appear equally critical to shaping pony responses, suggesting that training and familiarisation protocols may be as important as conscious emotional expression in human–equine interactions.
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Practical Takeaways
- •Ponies can discriminate human facial expressions from live humans, so handlers should be aware their emotional expressions may influence pony behavior and stress responses
- •Individual handler differences significantly affect pony responses independent of facial expression, suggesting relationship and familiarity matter as much as emotional displays
- •Experienced lesson ponies show more relaxed responses to handlers, supporting continued training and consistent handler interactions for improved welfare and predictability
Key Findings
- •Ponies displayed left eye preference when viewing angry expressions and right eye preference when viewing joyful expressions (p = 0.011)
- •Ponies spent significantly more time looking at angry facial expressions compared to other expressions (p = 0.0003)
- •Experience as a lesson mount correlated with lower heart rates, lower head carriage, left ear orientation toward actor, and increased oral behaviors
- •Heart rate did not vary across different facial expressions (p > 0.89), suggesting behavioral rather than physiological response to expressions