Greenland Sharks Carry Parasitic Copepods That Damage Their Eyes

Some individuals have parasites in both eyes, yet still reach lengths over five meters and survive for centuries.

Despite eye damage that would cripple most predators, they continue to hunt effectively in the deep sea, relying heavily on heightened smell and slow stealth movement.

Their survival with partial blindness underscores how deep ocean ecosystems prioritize non-visual sensory systems, challenging the assumption that apex predators require sharp eyesight.