Reef fish get riled when intruders glow red

Male fairy wrasses get feisty when a rival fluoresces

RED MESSAGE  In the mostly blue world of a coral reef, a male fairy wrasse (left, illuminated with white light) will take note when one of its kind sports a fluorescent red glow (right, under blue light).

T. Gerlach et al/Proc. Roy. Soc. B. 2014

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