The gentle giant of the Bering Sea vanished less than thirty years after discovery

Nature · Published 3 October 2026 Swipe more like this →

In short: When naturalist Georg Wilhelm Steller first encountered the Steller's sea cow in 1741, he found a massive, social creature that had no fear of humans. Within three decades, this gentle marine mammal was hunted to total extinction, driven by a desperate need for its meat, fat, and thick hide.

The Steller's sea cow, a member of the dugong family, was a biological marvel of the North Pacific. Unlike its tropical relatives, this sirenian adapted to frigid Arctic waters by growing to immense proportions, reaching lengths of up to 30 feet and weighing as much as 22,000 pounds. Its body was protected by a thick, bark-like hide and a layer of blubber nearly eight inches deep, which helped it survive in the cold Bering Sea. Unlike other sirenians, it was positively buoyant, meaning it could not fully submerge, leaving it constantly exposed at the surface.

Georg Wilhelm Steller, who documented the species during Vitus Bering’s 1741 expedition, described the animals as highly social and monogamous. They grazed on kelp forests in small family groups, with adults encircling their calves for protection. Because they had no natural predators, they showed no alarm when boats approached, allowing hunters to wade among them. Steller observed that mated pairs were deeply bonded; if one was harpooned, its partner would often linger in the shallows, attempting to assist the wounded animal even at the cost of its own life.

The species' demise was swift and brutal. After Bering’s crew used the sea cows to survive a harsh winter on Bering Island, news of the abundant, flavorful meat spread to fur traders. These hunters, lacking the expertise of indigenous Aleut populations, slaughtered the animals in staggering numbers. The situation worsened when the same traders drove sea otters to extinction, causing sea urchin populations to explode and devour the kelp forests that served as the sea cows' primary food source. By the time the species was fully described, it was already on the brink of collapse, disappearing completely by the late 1700s.

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