Why Are Sperm Whale Births So Rare to See? These Scientists Witnessed the Phenomenon Unexpectedly
The last scientific record of a sperm whale birth dates back to 1986 — and that account included only written observations. Now, a team of researchers has captured one of the most detailed wild sperm whale birth observations ever recorded, using drones, underwater microphones and shipboard photography off the coast of Dominica.
The event on July 8, 2023, revealed far more than a single calf entering the world. Over several hours, 11 whales — adults and juveniles — worked together to keep a struggling newborn alive, giving unprecedented insight into the social and vocal behaviors of these deep-diving giants.
How Scientists Documented the Sperm Whale Birth
The research team used a multi-pronged approach. Drones filmed the birth from above, giving a clear view of the mother, the calf and the assisting whales. Underwater microphones recorded the whales’ vocalizations — known as “codas” — allowing researchers to track shifts in communication during key moments. Shipboard observations and photography verified the identities of individual whales in the social unit.
By synchronizing all these data streams, the team documented not just the delivery but the hours-long cooperative effort that followed.
Initially, scientists were unsure of what was happening after seeing blood in the water.
“I initially thought that something bad was about to happen, until we saw the little head pop out and then the floppy flukes,” said Shane Gero, a CETI field biologist, referring to the whale’s tail, per CNN. “And then we knew that it was actually a joyous occasion.”
Why 11 Whales Worked Together to Save the Newborn After Birth
The birth process lasted roughly 30 to 34 minutes. But what happened afterward was equally striking.
Of the 11 whales present — mostly adult females — all members helped support the mother and lift the newborn. Adult females named “Faith” and “Hope” took turns raising the calf to the surface so it could breathe. Juvenile whales gently nudged the calf and kept it close to the mother. The mother rested on her side, flippers extended, as helpers supported the calf’s weight.
Some helpers were not related to the mother, showing cooperative social behavior that extends beyond kinship. That support was critical: newborn sperm whales are negatively buoyant and roughly 4 meters (13 feet) long at birth after a gestation period of approximately 14 to 16 months.
“These families are usually spread across kilometers as they dive and forage,” Gero said. “To have the entire family close together but not really active is kind of unusual.”
What the Birth Reveals About Sperm Whale Communication
Throughout the event, the whales produced coda vocalizations. Vocal patterns shifted during key moments — particularly during the birth itself and when short-finned pilot whales swam nearby. The shifting patterns suggest the whales were communicating to coordinate care and protect the newborn.
David Gruber, CETI founder and president, said the observations represent “an apex of complexity of sperm whale communication.”
Why Wild Sperm Whale Births Are Almost Never Seen
Fewer than 10 percent of cetacean species have been observed giving birth in the wild. For sperm whales, the record is even sparser. They do not typically give birth in easily accessible areas.
“The last scientific record of a sperm whale birth was in 1986, which included only written observations following the birth. Before that there are just a few scattered accounts from whaling vessels,” Gruber said. “What makes this study even more unique is that we have such detailed knowledge of each individual whale and their family relationships.”
Mauricio Cantor, a behavioral ecologist and assistant professor at Oregon State University’s Marine Mammal Institute who was not involved in the sighting, called it “one of the first detailed, quantitative records of a sperm whale birth in the wild — a life stage we almost never get to see in this species.”
The cooperative birth behavior may reflect ancient evolutionary traits in toothed whales — and evidence of complex social cooperation beyond primates.
“In a cooperative society, if we’re going to succeed, we need to work together, rather than constantly finding reasons to define how we are different,” Gero said. “It’s a pretty great message to take away from an animal that is fundamentally different from us.”
This article was created by content specialists using various tools, including AI.
