When Dolphins Carry Their Young: Care, Cost, and Questions

Instances of adult dolphins carrying dead calves have been documented repeatedly, and the behaviour is often labelled epimeletic care; females normally lead these responses while other group members may escort or support the pair. Researchers have even recorded sound patterns and detailed movements during such events, which provide data about social responses and communication in times of loss.

Carrying a non-swimming calf imposes measurable costs on the caregiver, since studies of swimming mechanics show reduced speed and higher energetic effort when an adult attempts to keep a calf at the surface, and these costs can compromise feeding and body condition if the behavior continues for days. Despite the physical cost, similar extended carrying has been observed in several cetacean species, from bottlenose dolphins to killer whales, where one famous case involved an orca that carried her dead calf for over two weeks.

While some scientists use words such as mourning or grieving to describe these responses, the precise mental states of dolphins remain uncertain, so researchers focus on measurable behaviours, acoustic records, and repeated observations to avoid unwarranted inference. Acoustic analyses, when available, can show changes in whistle structure and call rate that accompany close contact with a deceased calf.

Observations of epimeletic behaviour therefore deepen our understanding of social bonds in long-lived, highly social mammals, and they remind us that careful, evidence-based study is needed before equating animal responses with human emotions. Public videos and field photographs have increased report numbers, allowing scientists to compare many cases across regions.