The sea bear that rules the Arctic ice

Nature · Published 11 October 2026 Swipe more like this →

In short: The polar bear is the largest land-based carnivore on Earth, yet it is rarely on land. Known as the 'sea bear', this apex predator spends most of its life navigating the frozen Arctic waters, relying on sea ice to hunt, breed, and survive in a rapidly changing environment.

The polar bear, or Ursus maritimus, is a master of sensory detection. These predators possess a remarkable sense of smell that allows them to locate prey up to 32km away. In many instances, they can even detect seals hidden beneath compacted snow or ice from a distance of 1km. This acute olfactory ability is vital for their survival. Such precision ensures they can track prey through thick layers of frozen snow.

While they are formidable hunters, their survival is inextricably linked to the presence of sea ice. They use these frozen platforms to hunt their primary food source—seals—and to establish maternal dens. This dependence makes them highly vulnerable to the melting Arctic ice caused by climate change, a threat compounded by pollution, commercial activities, and human-wildlife conflict. Adults are also incredibly capable swimmers. They can traverse large distances between ice floes by swimming for several hours.

Currently, the species is classified as vulnerable. Estimates suggest that between 22,000 and 31,000 polar bears remain in the wild. Beyond their role as top predators in the Arctic food web, they serve as critical indicators of the overall environmental health of the region. Protecting them is essential for maintaining the balance of the entire Arctic ecosystem, which supports millions of people. Their physical adaptations include a dense layer of fat and a thick white coat. These features provide essential warmth and camouflage in harsh conditions.

As the Arctic environment shifts, conservation efforts are focusing on safeguarding essential habitats from industrial threats, such as oil and gas development. Organizations like the WWF are advocating for protected networks that connect key habitats and the 'Last Ice Area' to ensure these powerful predators can continue to thrive. Scientific research and habitat conservation remain central to these efforts. Supporting coexistence with local Arctic communities is also a priority.

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