Wired Science reports rats will over and over rescue another rat that was confined in an experiment. They seem to feel empathy for the distressed rat. Can one determine from watching the behavior what the rat's state of mind might be?A forty second video illustrates how it happens.
Popular Science has more detail. Rats found several ways to open the trapping door but it took them a number of days to teach themselves the skill which they applied promptly thereafter.
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