Climate change: Forcing polar bears to become cannibals?

Shocking new photographs of an adult polar bear feasting on a juvenile are raising red flags for environmentalists 

A male polar bear carries the head of a polar bear cub it killed and cannibalized in an area about 300 km north of the Canadian town of Churchill 08/12/2009
(Image credit: REUTERS/Iain Williams)

Is global warming driving polar bears to cannibalism? It certainly appears that way, say wildlife experts. And a jarring set of photographs published in the journal Arctic has provided a rare piece of evidence to support the theory. Here's what you should know:

What happened?

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