You’ve probably seen animals whose faces appear to express emotions. Your dog for example. Does his mouth turn up at the corners when you’re playing or when it’s dinnertime? No animal has more human-like facial expressions than our close relative the chimpanzee. They often flash a big teeth-baring grin when they are fooling around or when they want humans to pay special attention to them…perhaps even to like them. Whether or not these grins actually have something to do with a feeling of happiness, the delighted reaction they get from humans gives chimps a good reason to repeat them again and again New thinking on the subject is now allowing for the possibility that animals are expressing happiness when they “smile.” In fact several new theories go so far as to attribute primary emotions like fear, sadness, anger and happiness – and even some secondary emotions like jealousy and embarrassment – to animals. Think of the family dog that is “jealous” of a new baby. Or the one that hides in embarrassment after a bad haircut or a social breach.

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