On July 24, 2023, in the crystal-clear waters of the Caribbean, a female sperm whale named Rounder gave birth to her young. It was not a private affair: eleven whales surrounded her, forming a barrier of muscle and sound. Thanks to data published in Nature, we now know that without this “social network,” the newborn would not have had a chance.
Why the little ones sink
Just out of its mother’s womb, a baby sperm whale faces a biological paradox: it needs to breathe air, but its body naturally tends to sink.
This happens because of negative buoyancy: unlike adults, the infant has not yet accumulated enough fat (which is light and floats) and its “spermaceti organ”-a complex oil sac in the head that acts as a stabilizer-is not yet ready. Basically, the baby is a pebble in the middle of the ocean.
This is where collective assistance is triggered. Barely a minute after delivery, the entire group began pushing the baby’s body upward, using their snouts to keep him out of the water. They lifted it repeatedly for three hours, turning it into a living floating platform.
5,700 messages for one delivery
The Project CETI (Cetacean Translation Initiative) team recorded the event and discovered that the silence of the deep was interrupted by frantic communications traffic. Sperm whales communicate through tails, rhythmic sequences of clicks similar to Morse code.
During the delivery, the language changed. The group obsessively used the sequence “1+1+3” (two slow clicks and three fast ones), which serves as the clan’s signature. It is as if the whales are shouting out their identity to stay together, coordinating the movements necessary to support the mother and the calf in a synchronized dance of thousands of tons.
The wall against predators
Making the moment even more dramatic was the arrival of an outside “commando”: more than 50 pilot whales (pilot whales). Attracted by blood or the vulnerability of the moment, these predators attempted to ramm the mother.
The Rounder clan responded with a military strategy. Individuals not related to the mother-the group’s “aunts” and “friends”-formed a defensive wall. They used body language: gaping jaws and abrupt head movements. This is a demonstration of alloparenting: in sperm whales, caring for the young is a social endeavor that involves the entire clan, regardless of blood ties.
A 36-million-year-old strategy
DNA and behavioral analysis suggests that this “collaborative midwifery” is an evolutionary strategy that cetaceans have been honing for more than 36 million years.In an environment where a mistake of a few centimeters can mean drowning, sperm whales have chosen solidarity as their survival weapon. This discovery radically changes the way we must protect them: it is not enough to save “one whale,” we must save the group. If the social bond between these giants is broken, the young will have no one to push them to the surface for their first breath.
