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A well preserved Stenopterygius quadricissus fossil at the Senckenberg Museum in Germany. Its fins show evidence of collagen fibers arranged in a way that provides stiffness and strength. Scientists estimate the specimen is about 200 million years old. Credit: <a href=\Theagarten Lingham-Soliar "/>

A well preserved Stenopterygius quadricissus fossil at the Senckenberg Museum in Germany. Its fins show evidence of collagen fibers arranged in a way that provides stiffness and strength. Scientists estimate the specimen is about 200 million years old. Credit: Theagarten Lingham-Soliar

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