Harp seals combine anatomical and behavioral approaches to managing their body temperatures, instead of elevating their metabolic rate and energy requirements. Their lower critical temperature is believed to be under −10 degrees Celsius in air. Blubber insulates the Harp seals core but not the flippers as much, instead the flippers rely on having circulatory adaptations to help prevent heat loss through their flippers. A thick coat of blubber insulates its body and provides energy when food is scarce or during fasting. Blubber also streamlines its body for more efficient swimming. Brown fat warms blood as it returns from the body surface as well as providing energy, most importantly for newly-weaned pups.
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