Ronald K. Siegel writes that: "...one cannot ignore the elaborate burying behaviour of elephants as a similar sign of ritualistic or even religious behaviour in that species. When encountering dead animals, elephants will often bury them with mud, earth and leaves. Animals known to have been buried by elephants include rhinos, buffalos, cows, calves, and even humans, in addition to elephants themselves. Elephants have [been] observed burying their dead with large quantities of food fruit, flowers and colourful foliage."