Swordfish heat their eyes to see in the dark
Swordfish possess a unique ability to heat their eyes, sharpening their vision in the cold, dark deep sea to effectively hunt elusive prey.
Swordfish have a remarkable trick: they heat their eyes to hunt in the deep, dark ocean. These powerful predators dive over 1,000 meters, where temperatures plummet and light barely exists. To overcome this, swordfish use specialized muscle cells behind their eyes that generate heat without moving, warming their retinas by about 10 degrees Celsius.
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