"Elephants recognize the skeletons of other elephants and will often spend hours curiously examining the bones [...], especially when the bones are those of a relative.  When they pass upon the remains of family members, they become especially anxious.  [...]  An elephant may seem tense when inspecting the skull and tusks, and they frequently rearrange the bones or even carry them off to another spot." —from Alan M. Heatwole, Elephants, Gallery Books, 1991, [publication lacks page numbers]