Cleaner Shrimp Have Terrible Vision

Cleaner shrimp that pick parasites off reef fish are colorful creatures that live in a colorful environment. But a study of the visual capabilities of their stalk-like eyes finds they can’t see color at all, and the fish they serve just look like blurry smudges to them. Having discovered this, Duke Biology graduate student Eleanor Caves asks why the shrimp don’t see better and wonders what else helps them do their jobs so well.

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