Rats help a distressed cage-mate: what the science of empathy shows
Published by Planète Pets · managing editor: Clément Lacaille · how our guides are written
Faced with a cage-mate trapped inside a closed tube, a free rat doesn't ignore it: it eventually learns to open the door to release it, even with no reward waiting at the end. A landmark study by Bartal, Decety and Mason, published in 2011 in the journal Science, found that free rats learn to open a restrainer door to release a trapped cage-mate, and keep doing so even when a stash of chocolate is offered separately — evidence of prosocial behavior driven by another's distress rather than by self-interest (see the study). Find our other tips in the bedding and habitat section.
Contents · 4 sections
A behavior that looks like empathy
The rats tested only opened the door when a cage-mate was genuinely in distress inside the tube — not when the tube was empty or held an inert object. That detail matters: it rules out a simple reflex to open the door for company, and points instead to a genuine sensitivity to another rat's state, a form of behavioral empathy well documented in this social species.
What this means for a pet rat
This finding reinforces a principle rat owners already know: the species is built to live in groups, and a lone individual is cut off from an entire portion of its natural behavioral repertoire. Our article on whether a pet rat can live alone covers the risks of prolonged isolation. For rats already living in pairs or trios, this capacity to respond to a cage-mate's distress also translates into paying closer attention to shared enrichment, as our guide on pet rat enrichment explains.
A signal worth watching between cage-mates
In practice, a rat that seems "agitated" near a sick, trapped or stressed cage-mate isn't necessarily bothered by the noise: it may be responding to a genuine distress signal. That's one more reason to watch closely for any behavior change in one of the cage's occupants, and to see a vet promptly if in doubt.
Frequently asked questions
Does this study prove rats feel emotions the way humans do?
It proves a measurable, reproducible prosocial behavior, which is already solid evidence of sensitivity to another's state, though it doesn't establish a full equivalence with human empathy.
Can an isolated rat develop this kind of behavior?
The study involved rats that lived in groups before testing; social experience appears to play a role in this helping behavior emerging.
Should rats always be adopted in pairs?
Yes, in the vast majority of cases: the species is gregarious by nature, and a pair or trio lets it express this full social repertoire.
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This guide is part of Planète Pets’s Rodents universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.
