Uniquely human emotions don’t exist. More and more, I believe that we share all emotions with other species in the same way that we share virtually every organ in our bodies with them. No exceptions.
Like organs, the emotions evolved over millions of years to serve essential functions. Their usefulness has been tested again and again, giving them the wisdom of ages. They nudge us to do what is best for us. Some emotions may be more developed in humans, or apply to a wider range of circumstances, but none is fundamentally new.
— Frans de Waal in the New York Times