Since 2007, as fall sea ice has retreated, Pacific walruses have hauled out near Point Lay on Alaska's North Slope by the thousands in what has become an iconic image of climate change. But how long have they been doing it?
Bogoslof Island, the tip of a mostly submerged stratovolcano in the Aleutians, is only a few hundred years old. It's northern fur seal populations meanwhile is only a few decades old. But it's growing, a fact that's drawing marine mammal researchers.Molly Dischner