Rats play quid pro quo with each other, a form of tit-for-tat when looking for help from others and rats are happy to help each other out but only if another rat helps them out first, according to a new study. The study determined that rats figuratively play quid pro quo (a favor or advantage granted or expected in return for something when doing favours for one another). The rats will co-operated based on the last meeting with a partner and that rats can remember what happened in the distant past, but only use the most recent encounters with a partner.
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