A silent season: why no new North Atlantic right whales were born

Science · Published 12 October 2026 Swipe more like this →

In short: For nearly three decades, aerial observations have tracked the birth of new calves. But this season, researchers spotted nothing. With the population hovering around 380 individuals, the absence of newborns marks a terrifying potential turning point for a species already pushed to the brink.

The North Atlantic right whale (Eubalaena glacialis) is facing an existential crisis. While the species has been protected from commercial whaling since 1935, it has never recovered to its pre-whaling numbers. For nearly 1,000 years, whaling brought these baleen whales close to extinction, earning them the name 'right' whale because they were the ideal targets—they floated when killed.

Current data presents a complex picture. The most recent abundance estimate sits at approximately 380 whales, showing a slight increase of about 20 individuals since 2020. However, this growth is fragile. Researchers estimate there are only about 70 to 105 reproductively active females remaining in the wild. This low reproductive rate, combined with declining survival probabilities, has prevented a significant recovery over the last 25 years.

The most alarming recent development is the total absence of newborn calves this season. Historically, these whales average about 17 births per year during their winter calving season, which runs from mid-November to mid-April. This lack of sightings is unprecedented in nearly 30 years of aerial monitoring. The primary drivers of mortality remain human-related: entanglement in fishing gear and vessel strikes. Additionally, increasing ocean noise from human activity may increase stress and interfere with vital communication.

The stakes are high. While the Southern right whale (Eubalaena australis) thrives with an estimated population over 10,000, the North Atlantic species remains one of the rarest marine mammals on Earth. Scientists are cautiously optimistic that the sharp increase in mortalities seen over the last decade has slowed, but the lack of new births makes the species' future deeply uncertain.

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