X-ray Vision: Wedge-tail Triggerfish

February 21, 2012

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Triggerfish discourage predators by erecting two sharp dorsal spines: a large, thick one and a shorter spine behind it. The second spine is the “trigger”; it locks the first one in place.

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Smithsonian Exhibition “X-Ray Vision: Fish Inside Out” Gives Visitors a Unique Look into the Creatures of the Ocean