The smell of cooperation

Despite their reputation, rats are surprisingly sociable and regularly help each other out. Researchers at the Universities of Göttingen, Bern and St Andrews have shown that a rat just has to smell another rat that is engaged in helpful behaviour to increase their own helpfulness. This is the first study to show that just the smell of a cooperating rat is enough to trigger a helpful response. Research appeared in the Proceedings of the Royal Society B.
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