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簡介：提起黑熊，人們往往想起它憨態可掬的樣子，大家也許並不清楚，現在遍佈北美大陸各地的美洲黑熊其實並不是美洲大陸的“土著居民”。大約在350萬年到500萬年前，由於冰期的原因，阻隔北美與歐亞大陸的天塹白令海峽又一次變成了“通途”，這個美洲黑熊的祖先通過結冰的白令海峽而來到了北美洲。收起
《地理中國》 20120421 “世界地球日”特別節目《地球家園》——極地的困惑
《地理中國》 20120422 “世界地球日”特別節目《地球家園》——致命襲擊
《地理中國》 20120423 “世界地球日”特別節目《地球家園》——沙漠大調查（上）
《地理中國》 20120424 “世界地球日”特別節目《地球家園》——沙漠大調查（下）
《地理中國》 20120425 “世界地球日”特別節目《地球家園》——密林追蹤
《地理中國》 20120426 “世界地球日”特別節目《地球家園》——小島上的威脅
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