Marine scientists have achieved a remarkable breakthrough by documenting one of nature's rarest events: a sperm whale giving birth while receiving assistance from other females in her pod. The extraordinary footage was captured by researchers from Project CETI, an international initiative focused on understanding whale communication, during a nearly six-hour observation period off the Caribbean island of Dominica on July 8, 2023.
The birth involved a 19-year-old female named Rounder, who was delivering her second calf while surrounded by 10 other whales, including family members and unrelated females. The research team used boats, drones, and underwater recording equipment to document the entire process, creating an unprecedented scientific record of cetacean birth behavior.
This is the first evidence of birth assistance in non-primates. It is fascinating to see the intergenerational support from the grandmother to her labouring daughter, and the support from the other, unrelated females.
Shane Gero, Project CETI team member — New Scientist
The significance of this observation extends far beyond its rarity. Among the 93 known species of cetaceans—which include whales, dolphins, and porpoises—only nine have ever been observed giving birth in the wild. What makes this event even more exceptional is the collaborative nature of the birth, with non-related females actively participating in supporting both mother and newborn.
The actual birth process lasted 34 minutes, beginning when the calf's tail emerged from the water. During labor, adult females positioned themselves strategically under Rounder's dorsal fin, often swimming on their backs with their heads oriented toward her genital area. This positioning appears to be instinctual behavior designed to provide physical support during the birthing process.
The Guardian presents this as a significant scientific breakthrough, emphasizing the rarity of the observation and its evolutionary implications. The coverage focuses on the collaborative nature of the birth and the unique adaptations cetaceans developed for marine life.
Dawn frames the story as a spectacular scientific achievement, highlighting the international research collaboration and the exceptional nature of documenting whale birth behavior. The outlet emphasizes the evolutionary significance of the observed behaviors.
Immediately following the birth, the pod's behavior transformed dramatically. All adult whales became highly active, surrounding the newborn and engaging in what researchers described as protective and nurturing behaviors. The adults were observed pressing the calf between their bodies, touching it with their heads, and carefully maneuvering it through the water and across their bodies at the surface.
This collaborative birthing behavior reflects an evolutionary adaptation that dates back over 36 million years. Cetaceans are unique among mammals as the only group whose ancestors left the ocean, adapted to terrestrial life, and then returned to marine environments. This evolutionary journey required specific adaptations to prevent newborn drowning, including tail-first births rather than the head-first delivery typical of land mammals.
Despite becoming capable swimmers within hours of birth, newborn sperm whales initially sink after delivery. The assistance from pod members serves a critical survival function, lifting the calf to the surface to facilitate its first breaths and prevent drowning during those vulnerable initial moments. The research findings were published in the journals Scientific Reports and Science, marking a significant contribution to our understanding of cetacean social behavior and maternal care strategies.