Elephant behavior toward the dead: A review and insights from field observations.

Many nonhuman animals have been documented to take an interest in their dead. A few socially complex and cognitively advanced taxa-primates, cetaceans, and proboscideans-stand out for the range and duration of behaviors that they display at conspecific carcasses. Here, we review the literature on field observations of elephants at carcasses to identify patterns in behaviors exhibited. We add to this literature by describing elephant responses to dead elephants in the Samburu National Reserve, northern Kenya. The literature review indicated that behavior of elephants at carcasses most often included approaches, touching, and investigative responses, and these occurred at varying stages of decay, from fresh carcasses to scattered and sun-bleached bones. During our own observations, we also witnessed elephants visiting and revisiting carcasses during which they engaged in extensive investigative behavior, stationary behavior, self-directed behavior, temporal gland streaming, and heightened social interactions with other elephants in the vicinity of a carcass. Elephants show broad interest in their dead regardless of the strength of former relationships with the dead individual. Such behaviors may allow them to update information regarding their social context in this highly fluid fission-fusion society. The apparent emotionality and widely reported inter-individual differences involved in elephant responses to the dead deserve further study. Our research contributes to the growing discipline of comparative thanatology to illuminate the cognition and context of nonhuman animal response to death, particularly among socially complex species.