While they are in the Arctic, the whales typically feed for four to six months, Stewart said. Then, for the next six to eight months, they largely fast. That means the Arctic feeding grounds are their most important source of food.
Why food is less available in the region is complex, and scientists are still untangling it. What they know, according to Stewart, is that the system used to work like this: Algae would grow on the bottom of sea ice, then…
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