A study, by San Diego Zoo Global conservationists, released this week (Sept. 12, 2016) is shedding new light on how scientists evaluate polar bear diet and weight loss during their fasting season. On average, a polar bear loses up to 30 percent of its total body mass while fasting during the open-water season. Although some scientists previously believed land-based foods could supplement the bears' nutritional needs until the sea ice returns, a new study published in the scientific journal Physiological and Biochemical Zoology has revealed that access to terrestrial food is not sufficient to reduce the rate of body mass loss for fasting polar bears.

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Climate change and sea ice loss leaves polar bears exposed to more diseases, research suggests.

Pathogens are more common in polar bears living in the Chukchi Sea now than they were three decades ago, a new study suggests—but it's not yet clear what that means for the mammals' health

The polar bear, floating mournfully away on an ice floe as his habitat melts around him, is perhaps one of the most well-travelled symbols of the impacts of climate change.

All bear species except for one live in either temperate or tropical woodlands. Only the polar bear is a stranger to the forest, living and […]

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Increased sea ice drift forces polar bears to expend more energy walking on a fast-moving 'treadmill' of sea ice.

As polar bears struggle to survive in the fast-changing Arctic, MNN presents a tribute to the animals' legendary power, precocity and perseverance.

In the next decade, the tropics will suffer unprecedented climate change effects, long before the Arctic and its polar bears see big shifts.

Explore.org has affixed several high-definition cameras to locations in Churchill, Manitoba, the 'Polar Bear Capital of the World.'

Polar-bear dens, where mama bears raise young cubs during the harsh Alaska winters, could be identified using laser technology.

Polar bears have shifted to a diet of more land-based food in response to climate change and melting sea ice.

The conservation nonprofit Polar Bears International will use the 360-degree panoramas for educational outreach and scientific research.

The world's southernmost population of polar bears is waiting for sea ice to form just weeks before the U.N.'s climate change conference.

The new white Coca-Cola cans are part of a fundraising campaign to protect the Arctic.

Polar bears have ruled the Arctic for 100,000 years, but now they're struggling to keep up as the region undergoes a dramatic transformation.

Competitors from around the world line up on an Arctic ice floe to tackle one of the world's most difficult 26.2-mile races.

The predators burn energy 1.6 times faster than previously thought, a study finds, helping explain why the loss of sea ice hits them so hard.

Zoom in on this supposed image of sheep on a hillside and you'll be in for quite the surprise.

From the color of their skin to their amazing swimming ability, polar bears are full of surprises.

It's unclear exactly how many polar bears are left in the wild, but several populations likely face grave danger from climate change.

In his erudite analysis of the global warming issue, Don Blankenship of Massey Coal expressed his opinion about the future of polar bears:

Take a breathtaking 9-minute journey with wildlife photographer Vincent Munier through the beautifully bleak frozen North, you won’t be sorry.

There's a new polar bear live cam in town ...

Some 60 polar bears are loitering near Ryrkaipy in Chukotka Russia, a new occurrence which is prompting some to suggest permanent evacuation.

WARNING: GRAPHIC CONTENT. Jen Shears, 36, from Newfoundland, Canada, has been hunting since childhood and is now teaching her six-year-old daughter Aspen to hunt.

A Russian scientist reveals the animals are feeding on each other in the Arctic as melting ice and fossil fuel extraction companies are forcing the animals out of their traditional hunting grounds.