Observations in their natural habitat of animals’ reactions to recently deceased conspecifics are rare. Documenting a diversity of mammalian responses is essential to augment our understanding of potential evolutionary foundations of both mental states and social bonds. Individuals that previously had strong social ties to dead conspecifics might be expected to display different reactions than those who did not, and the degree of investigation of carcasses, or carrying of carcasses, has led some to infer that chimpanzees, Pan troglodytes (Anderson,