Polar bears obtain the majority of their annual nutrient reserves during the late winter. They hunt seals on the surface of sea ice. During this time, the sea ice is also at its highest density. Scien

Polar bears obtain the majority of their annual nutrient reserves during the late winter. They hunt seals on the surface of sea ice. During this time, the sea ice is also at its highest density. Scientists have been measuring the amount of arctic sea ice for decades, and their results can be seen below.