Biology
Thermoregulatory Adjustments in Polar Bears: Insulation and Fat Metabolism
Quick fact
A polar bear's blubber layer can be up to 11 centimeters thick, acting as an exceptional insulator that reduces heat loss to near zero in Arctic waters.
Why this is interesting
You've seen a polar bear's thick fur, but did you know that its body fat does more than keep it warm? It's a metabolic fuel source that also acts as a life jacket.