北极熊: 北极冰川面积减少，面临巨大生存挑战
北极熊（学名：Ursus maritimus意即海熊），又叫作白熊或冰熊，是熊属个一个种，是北极地区个典型动物，可能是六十多万年前（也有弗同个科学家认为是十五、二十、四十、甚至上百万年前），由灰熊演化出来。
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