The researchers suggest that capuchin monkeys, like humans, are guided by social emotions. In the wild, they are a cooperative, group-living species. Such cooperation islikely to be stable only when each animal feels it is not being cheated. Feelings of righteous indignation, it seems, are not the preserve of people alone. Refusing a lesser reward completely makes these feelings abundantly clear to other members of the group. However, whether such a sense of fairness evolved independently in capuchins and humans, or whether it stems from the common ancestor that the species had 35 million years ago, is, as yet, an unanswered question.

　參考答案：

　　研究人員暗示，和人類一樣，僧帽猴也受社會性情感的支配。在野外，它們是協(xié)作、群居的物種。只有在每個動物都覺得它沒有受到欺騙時，這種協(xié)作才有可能穩(wěn)定。如此看來，正當?shù)膽嵟胁⒎侨祟愃赜械摹Ｍ耆芙^較小的獎勵使得群體的其它成員非常清楚這些情感。不過，到現(xiàn)在為止，這種公平意識是否在僧帽猴世界和人類社會獨立演化，還是源于3500萬年前他們的共同祖先，這仍然是一個“懸而未解”的問題。