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In Images: Polar Bears' Shifting Diet

arctic habitats, environment
Two polar bears seen on the Arctic ice during a research cruise to map the ice in 3D.
(Image: © Scott Sorensen)

Changing habitat

Polar bear walking on a frozen pond with blowing snow near Cape Churchill, Canada.

(Image credit: Hansruedi Weyrich)

As the climate has changed, polar bears have shifted their diets in response, several new papers published in 2013 showed.

Melting sea ice

sea ice

Declines in sea ice have meant that polar bears in the western Hudson Bay cannot hunt their main prey for longer stretches of the year.

Preferred prey

polar bear with seal carcass

(Image credit: ©AMNH/R. Rockwell)

Historically, polar bears have mainly hunted for seals in gaps in the sea ice.

Snow geese

snow geese

When the sea ice melts in summer, polar bears come ashore. Then they also eat land-based foods such as snow geese.

Scat-sniffing dog

dog with polar bear scat

(Image credit: ©AMNH/R. Rockwell)

To see how climate change had affected polar bear diet, Linda Gormezano, a researcher at the American Museum of Natural History, and her colleagues, used a Dutch Shepard dog named Quinoa to find polar bear scat.

Ice dog

dutch shepard dog on ice flow

(Image credit: ©AMNH/L. Gormezano)

The dog found many piles of scat, and the team analyzed the contents.Here, quinoa sniffs for scat on an ice flow.

New diet

Caribou mom and calf, camera trap

(Image credit: WCS)

Compared to the 1960s, the polar bear diet had changed. They now prey upon caribou, whose populations have boomed in the area

Caribou carcass

polar bear eats caribou

(Image credit: ©AMNH/R. Rockwell)

Here, a polar bear with a caribou carcass.

Goose eggs

goose eggs

(Image credit: Dragon_Fang | Shutterstock.com)

Because the polar bears come ashore earlier, they are now on land when lesser snow geese are nesting, and now eat goose eggs as well.