In this July 17, 2012 photo released by the U.S. Geological Survey, female walruses and their young haul out of the water to rest between foraging dives in the U.S. waters of the Eastern Chukchi Sea in Alaska. The absence of vast swaths of summer sea ice is changing the behavior of Pacific walrus, federal scientists said Wednesday, but more research is needed to say what the final effects might be. (AP Photo/U.S. Geological Survey, S.A. Sonsthagen)

Associated Press
In this July 17, 2012 photo released by the U.S. Geological Survey, female walruses and their young haul out of the water to rest between foraging dives in the U.S. waters of the Eastern Chukchi Sea in Alaska. The absence of vast swaths of summer sea ice is changing the behavior of Pacific walrus, federal scientists said Wednesday, but more research is needed to say what the final effects might be. (AP Photo/U.S. Geological Survey, S.A. Sonsthagen)
In this July 17, 2012 photo released by the U.S. Geological Survey, female walruses and their young haul out of the water to rest between foraging dives in the U.S. waters of the Eastern Chukchi Sea in Alaska. The absence of vast swaths of summer sea ice is changing the behavior of Pacific walrus, federal scientists said Wednesday, but more research is needed to say what the final effects might be. (AP Photo/U.S. Geological Survey, S.A. Sonsthagen)
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