When one vole is scared, its counterpart will come over to comfort it by licking. They won't do this for strangers. The vole mates are also emotionally in sync: Their stress hormones will rise and fall with one another when one is hurt and the other is not.
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Researchers study them to better understand the evolutionary roots of empathy, emotion, and even love
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There's a fascinating history of scientists trying to figure out if rodents (even beady eyed rats) have emotions. Wrote about it a few years back, right herehttps://www.vox.com/science-and-health/2016/2/8/10925098/animals-have-empathy …
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