Mice pull their friends' tongues.

When a familiar cage mate stayed unresponsive after anesthesia, some mice escalated from sniffing and grooming to biting around the mouth and pulling the tongue. The tongue-pulling action was associated with a wider airway and faster recovery, while oxytocin signaling was required for the reviving-like behavior. The paper calls the response "reviving-like"; the experiment does not establish human-style CPR or conscious medical intent. 1

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