Sunlight is not redundant. A pale bar spills across the floor, and the cat parks its ribs inside it because fur is a blanket, not a furnace. You can see the calculation. Heat arrives free. Its coat traps a layer of air near the skin, slowing heat loss, yet it cannot create warmth once body heat leaks.The cat is being efficient. When room air sits below a cat's thermoneutral zone, thermoregulation ...More