" If attachment underlies care and sympathy, the attitude toward dead or dying companions is worth investigating because there is no more poignant evidence for attachment than agony following the final breath of a relative or companion. A well-known example is elephants, who sometimes pick up the ivory or bones of a dead herd member, hold the pieces in their trunks, and pass them around. Some pachyderms return for years to the spot where a relative died, touching and inspecting the relics. Do they miss the other? Do they recall how he or she was during life? "

― Frans de Waal , Good Natured: The Origins of Right and Wrong in Humans and Other Animals