REPORTS of dolphins interacting with dead members of their pod are raising questions about whether cetaceans understand the concept of death. Bottlenose dolphins in western Greece have been seen reacting to death differently depending on whether a pod member has died suddenly or after a longer period of illness, New Scientist has learned. Interpreting animal behaviour after the death of a companion is fraught with difficulty. Death is rarely observed in the wild, and it is easy to erroneously attribute human emotions to animals. Nevertheless, several species of intelligent, social animals, such as gorillas, chimps and elephants can display particular behaviours when an animal dies – behaviours which some have interpreted as akin to mourning. Taken together with a growing number of reports of cetaceans interacting with dead animals and the discovery that they have specialised neurons linked to empathy and intuition, the Greek study suggests dolphins may have a complex – and even sophisticated – reaction to death.