The footage was recorded off the coast of southeastern Australia in July 2025, according to a study published Wednesday (Sept. 16) in the journal Discover Animals. In the clip, a female humpback whale (Megaptera novaeangliae) hovers above her baby's motionless body on the seafloor and tries to make eye contact with the newborn, as if to check for signs of life.
Unlike the babies of toothed whales and porpoises, newborn humpback whales don't have enough blubber to float, so they sink without the help of an adult whale. This might partly explain why scientists had not witnessed a stillbirth in this species until now, Meynecke said, as the lifeless body sinks to the seabed immediately after birth and is almost impossible to spot from a distance.
The whale mom repeatedly tried to make eye contact with her calf, even though researchers think she was aware it died during birth. (Image credit: Andy Mulville)The whale had obviously just given birth, but there was no sign of the calf. So Mulville and others on the boat followed the female underwater with a GoPro camera. They found the calf dead on the seafloor, while the mother displayed what the study authors interpreted as "postmortem attentive behavior," or grieving.
The mother did not try to bring the calf's body to the surface, possibly because she realized that it had died during birth. This is different from the postmortem attentive behavior of toothed whales, which researchers have previously seen pushing stillborn babies above the water, according to the study.
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"It provides a rare window into the behavioural response of baleen [filter-feeding] whales toward a deceased member of their species but also in this case of a mother toward her calf," Meynecke said. "It provides important insight into the complex behaviours of the species and aligns with other observations of care taking, assisting distressed whales or even protecting other species from predators."
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