Pictured here: Two polar bears spar, or play fight, in Churchill, Manitoba.

图为两只北极熊在争吵或打闹，摄于马尼托巴丘吉尔。

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Two polar bears SPAR in the snow as a magenta sunset descends over Churchill, Manitoba, Canada.

品红色的暮光降临到加拿大曼尼·托巴省的丘吉尔小镇，两只北极熊正在雪中打闹。

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Two polar bears play in front of Kaktovik's old defence early warning site used during the cold war.

两个北极熊在卡克托维克一所冷战时期使用的预警防御建筑前玩耍。

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Researchers from the U.S. Geological Survey have estimated that two-thirds of polar bears will be gone by 2050.

CNN: Don't feed the (polar) bears

Two years ago, scientists compiling the internationally recognised Red List of Threatened Species decided to include polar bears, giving them a listing of Vulnerable to Extinction.

BBC: US ordered to act on polar bear