Damselfish go ultraviolet

James Gaier [creativecommon license] via Wikimedia CommonsThey may look drab to us in daylight, but like so many ravers, damselfish take on a new look under black light. The tiny fish have distinctive, species-specific ultraviolet-reflective facial markings that can be used by other fish for identification.

Lab Anim. (NY) 39, 93 (2010).
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