案例简介：照片: Keith Ladzinski @ ladzinski/一只北极熊优雅地游过格陵兰岛南部海岸清澈的海水。北极熊在水中花费了很多时间，因此被归类为海洋动物。在一个案例中，一只母熊被记录下来游泳超过400英里寻找食物，在此过程中失去了一只幼崽。随着北极冰层的消退速度更快，夏季被拉长，这给这些雄伟的偶像的生存带来了更大的压力。

案例简介：Photo by Keith Ladzinski @ladzinski / A polar bear gracefully swims through crystal-clear water off the coast of southern Greenland. Polar bears spend so much time in the water that they're classified as marine animals. In one case, a mother bear was recorded swimming over 400 miles in search for food, losing a cub in the process. With ice receding more rapidly in the Arctic, the summer season is elongated, placing higher pressure on the survival of these majestic icons.

国家地理 - Photo by Keith Ladzinski @ladzinski / A polar bear gracefully swims through crystal-clear water off the coast of southern

案例简介：照片: Keith Ladzinski @ ladzinski/一只北极熊优雅地游过格陵兰岛南部海岸清澈的海水。北极熊在水中花费了很多时间，因此被归类为海洋动物。在一个案例中，一只母熊被记录下来游泳超过400英里寻找食物，在此过程中失去了一只幼崽。随着北极冰层的消退速度更快，夏季被拉长，这给这些雄伟的偶像的生存带来了更大的压力。

国家地理 - Photo by Keith Ladzinski @ladzinski / A polar bear gracefully swims through crystal-clear water off the coast of southern

案例简介：Photo by Keith Ladzinski @ladzinski / A polar bear gracefully swims through crystal-clear water off the coast of southern Greenland. Polar bears spend so much time in the water that they're classified as marine animals. In one case, a mother bear was recorded swimming over 400 miles in search for food, losing a cub in the process. With ice receding more rapidly in the Arctic, the summer season is elongated, placing higher pressure on the survival of these majestic icons.

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国家地理 - Photo by Keith Ladzinski @ladzinski / A polar bear gracefully swims through crystal-clear water off the coast of southern

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