" Rats have been shown to engage in multiple forms of reciprocal help and cooperation, including what is referred to as direct reciprocity where a rat will help another rat that has previously helped them, " says Quinn.

“老鼠已经被证明会进行多种形式的互惠帮助和合作，包括所谓的直接互惠，一只老鼠会帮助另一只之前帮助过它们的老鼠，”Quinn 说。