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The last glimmer of sunlight disappears in the ocean’s twilight zone, a region that spans 200 to 1,000 meters in depth and has light levels similar to a starry night. Predators in this region tend to have eyes that face upward, like the and ; this is better for scanning the water above for silhouettes of potential prey.

But to veil their silhouettes, many of the twilight zone’s animals have . It’s helpful to be transparent in shallower waters too, of course. Take the anemone shrimp, which lives in waters shallower than 20 meters deep and is so transparent .

But in the ocean’s twilight zone, transparency has really taken off.��“I think you can find transparent representatives from every single animal phyla in the midwater,” says Laura Bagge, a visual ecologist at Torch Technologies who works as a contractor for the U.S. Department of Defense.

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