High-tech tracking collars on nine female polar bears have measured the animals' efforts to find food on the diminishing Arctic ice.
In Spring of 2014, 2015, and 2016, Anthony Pagano, a researcher at the University of California Santa Cruz and his colleagues, set out to track the polar bears' hunting and survival during this critical season.
The results give a polar bear's-eye view of the Arctic, and an increasing struggle.
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