Arctic ice loss forces polar bears to use four times as much energy to survive – study

Other predators such as narwhals are suffering similarly as unique adaptations become less suited

Polar bears and narwhals are using up to four times as much energy to survive because of major ice loss in the Arctic, according to scientists.

Once perfectly evolved for polar life, apex predators are struggling as their habitats shrink and unique adaptations become less suited to an increasingly ice-free Arctic, researchers say.

Related: Greenhouse gas emissions transforming the Arctic into 'an entirely different climate'