Sorrow is not an emotion that is restricted to humans, as anyone who has had a pet can attest. The bond between a person and their furry companion is a special relationship that transcends species, and when the time comes for that relationship to end, both parties are affected.
Dogs, for example, are known to display mourning in human-like ways, while cats are typically more calm and detached in their grief.
But it’s not just domesticated animals that experience sorrow. Even in the wild, animals mourn the loss of their own. Elephants, for example, are known to perform mourning rituals when one of their own dies.