Joel Sartoreさんのインスタグラム写真 - (Joel SartoreInstagram)「Thick hair plays an obvious role in keeping Arctic foxes like Todd warm, but what protects their feet as they trek across the frozen tundra? For starters, the arteries and veins carrying blood down to the fox’s feet and back up to their core are very close together. This placement allows for heat to transfer from the blood going down to the blood going up, warming the returning blood before it has a chance to cool the body’s core. Their paws also have polyunsaturated fats and unique membranes that keep them soft and functional at low temperatures while preventing tissue damage. Photo taken @greatbendks. #fox #arcticfox #tundra #todd #cute #fluffy #smiling #christmaseve #PhotoArk #savetogether」12月24日 23時25分