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Planet Earth

Do You See What Shrimp See?

The mantis shrimp can pick up on ultraviolet, infrared—and circular polarization.

mantisshrimp2.jpg
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What does the world look like through the eyes of a mantis shrimp? It’s not a question most of us would think to ask, but a new study has given us the answer: It looks like nothing humans (or any other animals) have ever seen.

It turns out that these exotic sea critters—affectionately known to the researchers in the study as “shrimp from Mars”—can see a kind of light that, as far as we know, is not apparent to any other animal on the planet. Not only that, but certain parts of the shrimps’ bodies can reflect the same kind of light, creating a signal only other mantis shrimp can see. Thanks to this phenomenon, the creatures have their own visual code—a completely private way to communicate with one another as they scuttle across the ocean floor.

A research team well versed in the ways of mantis shrimp was tipped off by a set of unusual structures within the animals’ eyes. These structures use the same principles as man-made detectors built to sense circularly polarized light—a specialized kind of light used to reduce the glare off computer monitors and take clearer photographs. When the researchers poked tiny electrodes into the shrimps’ eyes and directed circularly polarized light onto them, they found that the same cells responded in different ways, at times recognizing the properties of circularly polarized light.

As for what one mantis shrimp looks like to another, Tom Cronin, a biologist at the University of Maryland Baltimore County and one of the study’s authors, says that “it’s impossible to know.”

For more information on the super-sight of mantis shrimp, see the related Discoblog post.

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