Horses communicate with their eyes and mobile ears

Aug 04, 2014
Author Jennifer Wathan is shown with study participant Bartie. Credit: Jennifer Wathan

Horses are sensitive to the facial expressions and attention of other horses, including the direction of the eyes and ears. The findings, reported in the Cell Press journal Current Biology on August 4, are a reminder for us humans to look beyond our own limitations and recognize that other species may communicate in ways that we can't, the researchers say. After all, human ears aren't mobile.

"Our study is the first to examine a potential cue to that humans do not have: the ears," says Jennifer Wathan of the University of Sussex. "Previous work investigating communication of attention in animals has focused on cues that humans use: body orientation, head orientation, and eye gaze; no one else had gone beyond that. However, we found that in their ear position was also a crucial visual signal that other horses respond to. In fact, horses need to see the detailed of both eyes and ears before they use another horse's head direction to guide them."

The new study also challenges the earlier held notion that animals with eyes to the sides of their heads cannot glean information based on the direction of one another's gaze.

Wathan and the study's senior author Karen McComb took photographs to document cues given by horses when they were paying attention to something. Then Wathan and McComb used those photographs as life-sized models for other horses to look at as they chose between two feeding buckets. In each case, the horse in the photo was paying attention to one of the buckets and not the other. In some instances, the researchers also manipulated the image to remove information from key facial areas, including the eyes and the ears.

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Credit: Jennifer Wathan

The researchers' observations show that horses rely on the head orientation of their peers to locate food. However, that ability to read each other's interest level is disrupted when parts of the face—the eyes and —are covered up with masks. The ability to correctly judge attention also varied depending on the identity of the horse pictured, suggesting that individual facial features may be important, the researchers report.

Wathan and McComb plan to continue to explore facial features related to the expression of emotion in their horses, noting that horses' rich social lives and close relationship to humans make them particularly interesting as study subjects. Our understanding of horses' social lives might also have implications for their welfare.

"Horses display some of the same complex and fluid social organization that we have as humans and that we also see in chimpanzees, elephants, and dolphins," Wathan says. "The challenges that living in these societies create, such as maintaining valuable social relationships on the basis of unpredictable interactions, are thought to have promoted the evolution of advanced social and communicative skills. There is a general interest in studying species with this social structure."

Explore further: Investigating the respiratory health of horses and their owners

More information: Paper: Current Biology, Wathan et al.: "The eyes and ears are visual indicators of attention in domestic horses."

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Jim4321
2.3 / 5 (3) Aug 04, 2014
Uh, horses put their ears back when they are about to attack or they think that something is about to attack them. This is presumably to keep their ears from being bitten off if they get in a fight. Obviously, one of the first things a horse does when meeting a conspecific is decide whether the other horse is in attack mode -- ie by looking at the position of the ears. Similarly, subordinate horses will monitor the ear position of the dominant horse to see if they are about to get chastised for something --for example, getting in front of the dominant horse, or getting better feed than the dominant horse etc. Its amazing what gets published these days. Next thing, there will be an empirical survey about the social perception concerning the possibility that rocks fall.