You’re out in the cool Antarctic tundra. The winter breeze blows across the landscape, slicing at any living creature who dared to cross its path. Luckily you you have a waterproof coat to protect you from these extreme conditions and a thick layer of blubber underneath to keep you warm. You smile as you waddle across the snowy ice floor toward the horizon.
But look this is a penguin’s foot:
They have no blubber and no fur on their feet! How in the world are they not cold walking across the snowy Antarctic floor???