Morality may not be for humans alone. Scientists studying animal behavior say that they have growing evidence that species ranging from mice to primates are governed by moral codes of conduct in the same way as humans.

Pidgeon and monkey together

Pidgeon and monkey together

If humans were thought to be the only species to experience complex emotions and have a sense of morality, it looks like animals have it, too. And that allows them to tell the difference between right and wrong (unlike many humans).

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